[swift-evolution] Find/split on sub-string/sequence

[Daryle Walker]

There are sequence/collection/string methods to find an element/character or split a container on an element or one of a set of elements. But I haven't noticed methods that split on a sub-string, like wanting to split a string on exactly CR-LF and not on either individually. 

Shouldn't we add that? And a general version for sequences/collections. (I don't know if either the searched object and/or the match sub-object need to be a sequence or a collection.)

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