[ruby-core:121757] [Ruby Bug#21291] possible bug with /m regexp and $ based on input

28 Apr 2025


      Issue #21291 has been reported by zenspider (Ryan Davis).

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Bug #21291: possible bug with /m regexp and $ based on input
https://bugs.ruby-lang.org/issues/21291

* Author: zenspider (Ryan Davis)
* Status: Open
* ruby -v: 3.4.2
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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reported in discord by the.unnamed user:

``` ruby
#!/usr/bin/env -S ruby -vw
# => ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [arm64-darwin24]

p "a\n" =~ /$./m
# => 1
p "a\n" =~ /$.*/m
# => 1
p "aa\n" =~ /$./m
# => 2
p "aa\n" =~ /$.*/m       # !!!
# => nil
p "aa\n" =~ /$[\S\s]*/m
# => 2
```

goes back to at least 3.2.8


-- 
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