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Fix hashtag matching by replacing negative lookbehind with positive lookbehind (#37684)

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This commit is contained in:
Claire
2026-02-17 11:27:36 +01:00
committed by GitHub
parent 0a6412faf9
commit 4a6d17ad7b
2 changed files with 5 additions and 1 deletions
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2
app/models/tag.rb
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@@ -41,7 +41,7 @@ class Tag < ApplicationRecord
HASHTAG_LAST_SEQUENCE = '([[:word:]_]*[[:alpha:]][[:word:]_]*)'
HASHTAG_NAME_PAT = "#{HASHTAG_FIRST_SEQUENCE}|#{HASHTAG_LAST_SEQUENCE}".freeze
HASHTAG_RE = %r{(?<![=/)\p{Alnum}])[#＃](#{HASHTAG_NAME_PAT})}
HASHTAG_RE = /(?<=^|\s)[#＃](#{HASHTAG_NAME_PAT})/
HASHTAG_NAME_RE = /\A(#{HASHTAG_NAME_PAT})\z/i
HASHTAG_INVALID_CHARS_RE = /[^[:alnum:]\u0E47-\u0E4E#{HASHTAG_SEPARATORS}]/

4
spec/models/tag_spec.rb
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@@ -85,6 +85,10 @@ RSpec.describe Tag do
expect(subject.match('https://en.wikipedia.org/wiki/Ghostbusters_(song)?foo=#Lawsuit')).to be_nil
end
it 'does not match URLs with hashtag-like anchors after a dot' do
expect(subject.match('https://en.wikipedia.org/wiki/Google_LLC_v._Oracle_America,_Inc.#Decision')).to be_nil
end
it 'matches #ａｅｓｔｈｅｔｉｃ' do
expect(subject.match('this is #ａｅｓｔｈｅｔｉｃ').to_s).to eq '#ａｅｓｔｈｅｔｉｃ'
end