Issue #19282 has been reported by shohei.ein@gmail.com (Shohei Nakano). ---------------------------------------- Bug #19282: Regex error on ruby 3.2 https://bugs.ruby-lang.org/issues/19282 * Author: shohei.ein@gmail.com (Shohei Nakano) * Status: Open * Priority: Normal * ruby -v: 3.2.0 * 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 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"> ``` -- https://bugs.ruby-lang.org/