regex: add Regex::split_once method#1343
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RavuAlHemio wants to merge 1 commit intorust-lang:masterfrom
Open
regex: add Regex::split_once method#1343RavuAlHemio wants to merge 1 commit intorust-lang:masterfrom
Regex::split_once method#1343RavuAlHemio wants to merge 1 commit intorust-lang:masterfrom
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Convenience function that works like `str::split_once` in the standard library.
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Convenience function that works like
str::split_oncein the standard library.Motivation:
The most common syntax for the HTTP
WWW-Authenticateheader is:where the tokens are separated by one or more instances of whitespace.
split_oncewould allow quick splitting off<auth-scheme>from the<auth-param>s without the iteration and possible allocation behavior of full-fledgedsplit/splitn.Bonus for having this in
regexitself: getting the lifetime annotations right, especially in the return value, can be rather daunting for programmers new to Rust and trying their hand at an ad-hoc implementation -- I remember lots of trial and error before the whole thing clicked for me.