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There are many differencese between "compatible" regular expressions, for (many) examples read the end of section "Important Notes About Lookbehind" on [1] or c

• macintux 9y ago
  Erlang requires doubling up on escape backslashes, which generally causes me grief even after I flail about and finally remember it. Subtleties abound.
  • pjtr 9y ago
    Another strange one is the (old) Visual Studio syntax with its :i (actually often quite helpful) and $1 instead of \1 (even in the new syntax). https://msdn.microsoft.com/en-us/library/2k3te2cs(v=vs.110).aspx https://msdn.microsoft.com/en-us/library/2k3te2cs(v=vs.110)....