'TextHelper#highlight' now accepts a block to highlight the matched words.
The helper will yield each matched word, and you can use this instead of the ':highlighter' option for more complex replacing logic: highlight('My email is me@work.com', EMAIL_REGEXP) { |m| mail_to(m) } # => 'My email is <a href="mailto:me@work.com">me@work.com</a>'
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