Bug #21503: \p{Word} does not match on \p{Join_Control} while docs say it does

• Status: Open
• Assignee: -
• Target version: -
• ruby -v: 3.4.4
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[procmarco (Marco Concetto Rudilosso)]

in the docs it is mentioned that \p{Word} matches the equivalent of: [\p{M}\p{Nd}\p{Pc}\p{Alpha}\p{Join_Control}] as it's also defined in the unicode spec

the issue is that it does not seem to be the case

irb(main):018> REGEX = /\p{Word}/u
=> /\p{Word}/
irb(main):019> "\u200D".gsub(REGEX, "-")
=> "‍"
irb(main):020> REGEX2 = /\p{Join_Control}/u
=> /\p{Join_Control}/
irb(main):021> "\u200D".gsub(REGEX2, "-")
=> "-"

There's 2 solutions here, either we change the docs or the code.

[procmarco (Marco Concetto Rudilosso)]

What I mean is that the current implementation of \p{Word} does not seem to match \p{Join_Control} even though it should and it also says so in the docs

[mame (Yusuke Endoh)]

• Related to Bug #19417: Regexp \p{Word} and [[:word:]] do not match Unicode Other_Number character added

[mame (Yusuke Endoh)]

There is already a PR for that: https://github.com/ruby/ruby/pull/7711

Can you take a look? @duerst (Martin Dürst) @naruse (Yui NARUSE)