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Bug #20098

open

Wrong regexp match in ruby 3.2 and 3.3

Added by tompng (tomoya ishida) 2 months ago. Updated 17 days ago.

Status:
Open
Assignee:
-
Target version:
-
ruby -v:
ruby 3.3.0 (2023-12-25 revision 5124f9ac75) +MN [arm64-darwin22]
[ruby-core:115933]

Description

These regexp all matches in ruby 3.1.4, but not in ruby 3.3.0.

p /a((.|.)|bc){,4}z/.match? 'abcbcbcbcz'
p /a(b+?c*){4,5}z/.match? 'abbbccbbbccbcbcz' # matches in ruby 3.2.2
p /a(b+?(.|.)){2,3}z/.match? 'abbbcbbbcbbbcz'
p /a(b*?(.|.)[bc]){2,5}z/.match? 'abcbbbcbcccbcz'

Adding backref (to disable optimization) makes them match.

p /()\1a((.|.)|bc){,4}z/.match? 'abcbcbcbcz'
p /()\1a(b+?c*){4,5}z/.match? 'abbbccbbbccbcbcz'
p /()\1a(b+?(.|.)){2,3}z/.match? 'abbbcbbbcbbbcz'
p /()\1a(b*?(.|.)[bc]){2,5}z/.match? 'abcbbbcbcccbcz'

Found in this script https://gist.github.com/tompng/aa0706a181e9187bd79e8cec5a5f3c97

Updated by tompng (tomoya ishida) 2 months ago

Not same. https://bugs.ruby-lang.org/issues/20083 is fixed in master branch. This issue is found in a branch that fixes 20083.

Updated by weilandia (Nick Weiland) 17 days ago

Looks to be the same bug, but I cannot make it match with the backref. Below example matches in 3.2.2 but not in 3.3.0

str = "------------abcdefg------------#3895912"
re = /()\1\b\w*[a-zA-Z-]*\d+[\w-]{3,}\w+\b/
re.match?(str)
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