3 ms·

a more accurate term would be "BRE with GNU extensions", e.g. \(\)

• jwilk 9y ago
  \(\) are part of BRE syntax. They are not GNU extensions. Source: http://pubs.opengroup.org/onlinepubs/7908799/xbd/re.html#tag_007_003_006 http://pubs.opengroup.org/onlinepubs/7908799/xbd/re.html#tag...
  • Hello71 9y ago
    er, I meant \{\}.
    • jwilk 9y ago
      \{n\}, \{n,\} and \{n,m\} are all in POSIX. \{,m\} is a (pretty obscure) GNU extensions.
      • Hello71 9y ago
        hm, I could've sworn it wasn't. http://www.regular-expressions.info/gnu.html http://www.regular-expressions.info/gnu.html says that \?, \+, and \| are GNU extensions though.