From: "Sho (Shohei Nakano) via ruby-core" <ruby-core@...>
Date: 2023-01-23T04:52:39+00:00
Subject: [ruby-core:111985] [Ruby master Bug#19283] Regex error on ruby 3.2

Issue #19283 has been updated by Sho (Shohei Nakano).





This case didn't become error after I tested this regex error case with ruby master branch(https://github.com/ruby/ruby/commit/5abb2ef1532e52f3e5fb63ea25e90a72c8e7d581). 

This issue may be resolved by Bug #19273 and PR(https://github.com/ruby/ruby/pull/7035).





----------------------------------------

Bug #19283: Regex error on ruby 3.2

https://bugs.ruby-lang.org/issues/19283#change-101423



* Author: Sho (Shohei Nakano)

* Status: Open

* Priority: Normal

* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]

* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN

----------------------------------------

There is an regex error pattern on ruby 3.2.0. This pattern is success on ruby 3.1.3.

Is this a bug? Or, is ruby 3.2.0 correct?





- ruby 3.2.0



```

# ruby -v

ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]

(byebug) MAX_CHAR_LENGTH = 8

8

(byebug) WHITE_SPACE_STR = '[[:space:]]���\uFEFF\u00A0\u200B\u180E'

"[[:space:]]���\\uFEFF\\u00A0\\u200B\\u180E"

(byebug) r = /\A((.{,#{MAX_CHAR_LENGTH}}x)|(.{,#{MAX_CHAR_LENGTH}}a[#{WHITE_SPACE_STR}]+b.{,#{MAX_CHAR_LENGTH}}))[#{WHITE_SPACE_STR}]*\Z/ix

/\A((.{,8}x)|(.{,8}a[[[:space:]]���\uFEFF\u00A0\u200B\u180E]+b.{,8}))[[[:space:]]���\uFEFF\u00A0\u200B\u180E]*\Z/ix

(byebug) r.match('a b')

#<MatchData "a b" 1:"a b" 2:nil 3:"a b">

(byebug) MAX_CHAR_LENGTH = 9

9

(byebug) r = /\A((.{,#{MAX_CHAR_LENGTH}}x)|(.{,#{MAX_CHAR_LENGTH}}a[#{WHITE_SPACE_STR}]+b.{,#{MAX_CHAR_LENGTH}}))[#{WHITE_SPACE_STR}]*\Z/ix

/\A((.{,9}x)|(.{,9}a[[[:space:]]���\uFEFF\u00A0\u200B\u180E]+b.{,9}))[[[:space:]]���\uFEFF\u00A0\u200B\u180E]*\Z/ix

(byebug) r.match('a b')

nil

```



- ruby 3.1.3



```

# ruby -v

ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]

(byebug) MAX_CHAR_LENGTH = 8

8

(byebug) WHITE_SPACE_STR = '[[:space:]]���\uFEFF\u00A0\u200B\u180E'

"[[:space:]]���\\uFEFF\\u00A0\\u200B\\u180E"

(byebug) r = /\A((.{,#{MAX_CHAR_LENGTH}}x)|(.{,#{MAX_CHAR_LENGTH}}a[#{WHITE_SPACE_STR}]+b.{,#{MAX_CHAR_LENGTH}}))[#{WHITE_SPACE_STR}]*\Z/ix

/\A((.{,8}x)|(.{,8}a[[[:space:]]���\uFEFF\u00A0\u200B\u180E]+b.{,8}))[[[:space:]]���\uFEFF\u00A0\u200B\u180E]*\Z/ix

(byebug) r.match('a b')

#<MatchData "a b" 1:"a b" 2:nil 3:"a b">

(byebug) MAX_CHAR_LENGTH = 9

9

(byebug) r = /\A((.{,#{MAX_CHAR_LENGTH}}x)|(.{,#{MAX_CHAR_LENGTH}}a[#{WHITE_SPACE_STR}]+b.{,#{MAX_CHAR_LENGTH}}))[#{WHITE_SPACE_STR}]*\Z/ix

/\A((.{,9}x)|(.{,9}a[[[:space:]]���\uFEFF\u00A0\u200B\u180E]+b.{,9}))[[[:space:]]���\uFEFF\u00A0\u200B\u180E]*\Z/ix

(byebug) r.match('a b')

#<MatchData "a b" 1:"a b" 2:nil 3:"a b">

```









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