<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Look no further, the iterator in a loop context is an actual iterator and lazy:<div class=""><br class=""></div><div class=""><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);"><span class="" style="color: rgb(186, 45, 162);">for</span><span class="" style="color: rgb(0, 0, 0);"> groups </span><span class="" style="color: rgb(186, 45, 162);">in</span><span class="" style="color: rgb(0, 0, 0);"> </span><span class="" style="color: rgb(79, 129, 135);">props</span><span class="" style="color: rgb(0, 0, 0);">[</span>"(\\w+)\\s*=\\s*(.*)"<span class="" style="color: rgb(0, 0, 0);">] {</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);"> <span class="" style="color: rgb(79, 129, 135);">params</span>[<span class="" style="color: rgb(112, 61, 170);">String</span>(groups[<span class="" style="color: rgb(39, 42, 216);">1</span>]!)] = <span class="" style="color: rgb(112, 61, 170);">String</span>(groups[<span class="" style="color: rgb(39, 42, 216);">2</span>]!)</div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);">}</div><div class=""><br class=""></div><div class="">If you break half way through the remaining matches will not have been performed.</div><div class=""><br class=""></div><div class="">This is as opposed to the following which would be exhaustive.</div><div class=""><br class=""></div><div class=""><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);"><span class="" style="color: rgb(186, 45, 162);">if</span> <span class="" style="color: rgb(186, 45, 162);">let</span> allGroupsOfAllMatches: [[<span class="" style="color: rgb(112, 61, 170);">Substring</span>?]] = <span style="color: rgb(79, 129, 135);" class="">props</span>[<span style="color: rgb(209, 47, 27);" class="">"(\\w+)\\s*=\\s*(.*)"</span>] {</div></div><div class=""><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);"><span class="" style="color: rgb(186, 45, 162);"> for</span><span class="" style="color: rgb(0, 0, 0);"> groups </span><span class="" style="color: rgb(186, 45, 162);">in</span><span class="" style="color: rgb(0, 0, 0);"> </span><span class="" style="color: rgb(0, 0, 0);">allGroupsOfAllMatches {</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);"> <span class="" style="color: rgb(79, 129, 135);">params</span>[<span class="" style="color: rgb(112, 61, 170);">String</span>(groups[<span class="" style="color: rgb(39, 42, 216);">1</span>]!)] = <span class="" style="color: rgb(112, 61, 170);">String</span>(groups[<span class="" style="color: rgb(39, 42, 216);">2</span>]!)</div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);"> }</div></div><div class="">}</div><div class=""><br class=""></div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On 11 Jan 2018, at 18:15, C. Keith Ray <<a href="mailto:keithray@mac.com" class="">keithray@mac.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class="">That looks great. One thing I would look for is iterating over multiple matches in a string. I'd want to see lazy and non-lazy sequences.<div class=""><br class=""></div><div class=""> let wordMatcher = Regex(":w*") // or whatever matches word-characters </div><div class=""> // separated by non-word character.<br class=""><br class=""> for w in aString[allMatches: wordMatcher] { print(w) }</div><div class=""><br class=""></div><div class=""> for w in warAndPeaceNovel[allMatchesLazy: wordMatcher].prefix(50) { print(w) }</div><div class=""><br class=""><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">--<br class="">C. Keith Ray</span><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">* <a href="https://leanpub.com/wepntk" class="">https://leanpub.com/wepntk</a> <- buy my book?<br class="">* </span><a href="http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf" class="">http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf</a><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class="">* <a href="http://agilesolutionspace.blogspot.com/" class="">http://agilesolutionspace.blogspot.com/</a></span></div></div><div class=""><br class="">On Jan 11, 2018, at 9:50 AM, John Holdsworth via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Michael,</div><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""></div><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Thanks for sending this through. It’s an interesting read. One section gave me pause however. I feel Swift should resist the siren call of combining Swift Syntax with Regex syntax as it falls on the wrong side of Occam's razor. ISO Regex syntax is plenty complex enough without trying to incorporate named capture, desirable as it may be. Also, if I was to go down that route, I’d move away from / as the delimiter which is a carry over from Perl to something like e”I am a regex” to give the lexer more to go on which could represent say, a cached instance of NSRegularExpression.</div><div class=""><br class=""></div>And now for something completely different...<br class=""><div class=""><br class=""></div><div class="">Common usage patterns for a regex fall into 4 categories: deconstruction, replacement, iteration and switch/case. Ideally the representation of a regex match would the same for all four of these categories and I’d like to argue a set of expressive regex primitives can be created without building them into the language.</div><div class=""><br class=""></div><div class="">I’ve talked before about a regex match being coded as a string/regex subscripting into a string and I’ve been able to move this forward since last year. While this seems like an arbitrary operator to use it has some semantic sense in that you are addressing a sub-part of the string with pattern as you might use an index or a key. Subscripts also have some very interesting properties in Swift compared to other operators or functions: You don’t have to worry about precedence, they can be assigned to, used as an interator, and I've learned since my last email on this topic that the <i class="">Swift type checker will disambiguate multiple subscript overloads on the basis of the type of the variable is being assigned to</i>.</div><div class=""><br class=""></div><div class="">An extension to String can now realise the common use cases by judicious use of types:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">var</span><span style="" class=""> input = </span>"Now is the time for all good men to come to the aid of the party"</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class=""><br class=""></span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">if</span><span style="" class=""> </span><span style="color: #4f8187" class="">input</span><span style="" class="">[</span>"\\w+"<span style="" class="">] {</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="" class=""> </span><span style="color: #3e1e81" class="">print</span><span style="" class="">(</span>"match"<span style="" class="">)</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0); background-color: rgb(255, 255, 255);" class="">// receiving type controls data you get</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">if</span> <span style="color: #ba2da2" class="">let</span> firstMatch: <span style="color: #703daa" class="">Substring</span> = <span style="color: #4f8187" class="">input</span>[<span style="color: #d12f1b" class="">"\\w+"</span>] {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #3e1e81" class="">print</span>(<span style="color: #d12f1b" class="">"match: </span>\<span style="color: #d12f1b" class="">(</span>firstMatch<span style="color: #d12f1b" class="">)"</span>)</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);" class=""><span style="color: rgb(186, 45, 162);" class="">if</span> <span style="color: rgb(186, 45, 162);" class="">let</span> groupsOfFirstMatch: [<span style="color: rgb(112, 61, 170);" class="">Substring</span>?] = <span style="color: rgb(79, 129, 135);" class="">input</span>[<span style="color: rgb(209, 47, 27);" class="">"(all) (\\w+)"</span>] {</div></div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #3e1e81" class="">print</span>(<span style="color: #d12f1b" class="">"groups: </span>\<span style="color: #d12f1b" class="">(</span>groupsOfFirstMatch<span style="color: #d12f1b" class="">)"</span>)</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0); background-color: rgb(255, 255, 255);" class="">// "splat" out up to N groups of first match</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="color: rgb(186, 45, 162);" class="">if</span> <span style="color: rgb(186, 45, 162);" class="">let</span> (group1, group2): (<span style="color: rgb(112, 61, 170);" class="">String</span>, <span style="color: rgb(112, 61, 170);" class="">String</span>) = <span style="color: rgb(79, 129, 135);" class="">input</span>[<span style="color: rgb(209, 47, 27);" class="">"(all) (\\w+)"</span>] {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="" class=""> </span><span style="color: #3e1e81" class="">print</span><span style="" class="">(</span>"group1: <span style="" class="">\</span>(<span style="" class="">group1</span>), group2: <span style="" class="">\</span>(<span style="" class="">group2</span>)"<span style="" class="">)</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">if</span> <span style="color: #ba2da2" class="">let</span> allGroupsOfAllMatches: [[<span style="color: #703daa" class="">Substring</span>?]] = <span style="color: #4f8187" class="">input</span>[<span style="color: #d12f1b" class="">"(\\w)(\\w*)"</span>] {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #3e1e81" class="">print</span>(<span style="color: #d12f1b" class="">"allGroups: </span>\<span style="color: #d12f1b" class="">(</span>allGroupsOfAllMatches<span style="color: #d12f1b" class="">)"</span>)</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div></div><div class=""><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);" class="">// regex replace by assignment</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27);" class=""><span style="color: rgb(79, 129, 135);" class="">input</span><span style="" class="">[</span>"men"<span style="" class="">] = </span>"folk"</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(62, 30, 129);" class="">print<span style="" class="">(</span><span style="color: rgb(79, 129, 135);" class="">input</span><span style="" class="">)</span></div></div><div class=""><br class=""></div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0); background-color: rgb(255, 255, 255);" class="">// parsing a properties file using regex as iterator</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">let</span> props = <span style="color: #d12f1b" class="">"""</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""> name1 = value1</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""> name2 = value2</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""> """</div><div style="margin: 0px; line-height: normal; background-color: rgb(255, 255, 255); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">var</span> params = [<span style="color: #703daa" class="">String</span>: <span style="color: #703daa" class="">String</span>]()</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(209, 47, 27); background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">for</span><span style="" class=""> groups </span><span style="color: #ba2da2" class="">in</span><span style="" class=""> </span><span style="color: #4f8187" class="">props</span><span style="" class="">[</span>"(\\w+)\\s*=\\s*(.*)"<span style="" class="">] {</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #4f8187" class="">params</span>[<span style="color: #703daa" class="">String</span>(groups[<span style="color: #272ad8" class="">1</span>]!)] = <span style="color: #703daa" class="">String</span>(groups[<span style="color: #272ad8" class="">2</span>]!)</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(79, 129, 135); background-color: rgb(255, 255, 255);" class=""><span style="color: #3e1e81" class="">print</span><span style="" class="">(</span>params<span style="" class="">)</span></div></div><div class=""><span style="" class=""><br class=""></span></div><div class="">The case for switches is slightly more opaque in order to avoid executing the match twice but viable.</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0); background-color: rgb(255, 255, 255);" class=""><span style="color: rgb(186, 45, 162);" class="">let</span> match = <span style="color: rgb(79, 129, 135);" class="">RegexMatch</span>()</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(186, 45, 162); background-color: rgb(255, 255, 255);" class="">switch<span style="" class=""> </span><span style="color: #4f8187" class="">input</span><span style="" class=""> {</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(79, 129, 135); background-color: rgb(255, 255, 255);" class=""><span style="color: #ba2da2" class="">case</span><span style="" class=""> </span>RegexPattern<span style="" class="">(</span><span style="color: #d12f1b" class="">"(\\w)(\\w*)"</span><span style="" class="">, capture: </span>match<span style="" class="">):</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #ba2da2" class="">let</span> (first, rest) = <span style="color: #4f8187" class="">input</span>[<span style="color: #4f8187" class="">match</span>]</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""> <span style="color: #3e1e81" class="">print</span>(<span style="color: #d12f1b" class="">"</span>\<span style="color: #d12f1b" class="">(</span>first<span style="color: #d12f1b" class="">) </span>\<span style="color: #d12f1b" class="">(</span>rest<span style="color: #d12f1b" class="">)"</span>)</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(186, 45, 162); background-color: rgb(255, 255, 255);" class="">default<span style="" class="">:</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; color: rgb(186, 45, 162); background-color: rgb(255, 255, 255);" class=""><span style="" class=""> </span>break</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class="">}</div></div><div class=""><br class=""></div><div class="">This is explored in the attached playground (repo: <a href="https://github.com/johnno1962/SwiftRegex4" class="">https://github.com/johnno1962/SwiftRegex4</a>)</div><div class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></blockquote><blockquote type="cite" class=""><div class=""><SwiftRegex4.playground.zip></div></blockquote><blockquote type="cite" class=""><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""></div><div class=""><br class=""></div><div class="">I’m not sure I really expect this to take off as an idea but I’d like to make sure it's out there as an option and it certainly qualifies as “out there”.</div><div class=""><br class=""></div><div class="">John</div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 10 Jan 2018, at 19:58, Michael Ilseman via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hello, I just sent an email to swift-dev titled "State of String: ABI, Performance, Ergonomics, and You!” at <a href="https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20180108/006407.html" class="">https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20180108/006407.html</a>, whose gist can be found at <a href="https://gist.github.com/milseman/bb39ef7f170641ae52c13600a512782f" class="">https://gist.github.com/milseman/bb39ef7f170641ae52c13600a512782f</a>. I posted to swift-dev as much of the content is from an implementation perspective, but it also addresses many areas of potential evolution. Please refer to that email for details; here’s the recap from it:<br class=""><br class="">### Recap: Potential Additions for Swift 5<br class=""><br class="">* Some form of unmanaged or unsafe Strings, and corresponding APIs<br class="">* Exposing performance flags, and some way to request a scan to populate them<br class="">* API gaps<br class="">* Character and UnicodeScalar properties, such as isNewline<br class="">* Generalizing, and optimizing, String interpolation<br class="">* Regex literals, Regex type, and generalized pattern match destructuring<br class="">* Substitution APIs, in conjunction with Regexes.<br class=""><br class="">_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a><br class=""></div></div></blockquote></div><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></blockquote><blockquote type="cite" class=""><div class=""><span class="">_______________________________________________</span><br class=""><span class="">swift-evolution mailing list</span><br class=""><span class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a></span><br class=""><span class=""><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" class="">https://lists.swift.org/mailman/listinfo/swift-evolution</a></span><br class=""></div></blockquote></div></div></div></blockquote></div><br class=""></div></div></div></div></div></div></div></body></html>