[SR-6362] Raw escaping in string literals

[johnno1962]

Previous ID	SR-6362
Radar	rdar://problem/47725014
Original Reporter	@johnno1962
Type	New Feature
Status	Closed
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	New Feature, LanguageFeatureRequest
Assignee	@johnno1962
Priority	Medium

md5: 0d6a3785983c156c861de08a567e4986

Issue Description:

Often it is inconvenient and opaque entering string literals that are in tended as regex patterns into a swift source.

Taking the lead from python it perhaps a new syntax r"\w+\s+\w" could be added to the swift language. This would be equivalent to " w+ s+ w". The specification required would be that if a string literal is preceded by r then unknown escapes are passed though to the literal as-is including the back-slash character rather than going an error. This would be a very minor change confined to Lexer.cpp that I'll work on tomorrow and present to swift-evolution.

[belkadan]

I think the "r" stands for "raw", not "regex".

[johnno1962]

https://forums.swift.org/t/se-0200-enhancing-string-literals-delimiters-to-support-raw-text/15420/65

[beccadax]

Just adding a radar number; nothing to see here.

[AnthonyLatsis]

Proposal: SE-0200