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A comment on Explainshell – match command-line arguments to their help text. Parent comment

Re:Explainshell – match command-line arguments to their help... by JelteF on Friday August 30, 2013 @06:40AM (#6301046)
True for official regular expressions, but not for the ones used in most programming languages. http://nikic.github.io/2012/06/15/The-true-power-of-regular-...
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Re:Explainshell – match command-line arguments to their help... by mtdewcmu on Friday August 30, 2013 @03:55PM (#6303839)
True. Perl-style regexes have grown capabilities far beyond regexes in formal language theory. Note that I was referring to DFAs.
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