this post was submitted on 08 Jun 2025
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You've got lots of answers, so I'll just say that shorthand character classes like \s, \w, and \d - all those backslash ones - are not widely supported, especially in the only POSIX tools. Many tools have an extended or Perl mode that makes them available, but some don't. You can't rely on them being everywhere. That's why you're getting suggestions to use explicit, long-form character classes like [0-9].