[ruby-core:75554] [Ruby trunk Feature#8110] Regex methods not changing global variables

Issue #8110 has been updated by Akira Tanaka.


How about Regexp#match? to return bool without MatchData?

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Feature #8110: Regex methods not changing global variables
https://bugs.ruby-lang.org/issues/8110#change-58688

* Author: Ilya Vorontsov
* Status: Assigned
* Priority: Normal
* Assignee: Yukihiro Matsumoto
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It is useful to have methods allowing pattern matching without setting global variables. It can be very hard to understand where the problem is when you for example insert a string like `puts pat === my_str` and your program fails in a place which is far-far away from inserted place. This can happen due to replacing global variables of previous pattern match. I caught to this when placed pattern-match inside case-statement and shadowed global vars which were initially filled by match in when-statement.
For now one can extract pattern matching into another method thus defining method-scope for that variables. But sometimes it looks like an overkill. May be simple method like #match_globalsafe can prevent that kind of errors. At least when a programmer see such a method in a list of methods, he's warned that usual match can cause such problems.



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