4 ms·

This is an illustration that grep is a great tool, quick and easy to use.

• behnamoh 4y ago
  rather egrep, though
  • sizzzzlerz 4y ago
    Can egrep do lookaheads or behinds? I find it necessary to use positive lookaheads to verify the test words include all the letters marked present but in the wrong location.
    • lancebeet 4y ago
      I was also curious about this as I use grep -P (for PCRE regexes) if I need to use them. Looking at the manual, lookaheads and lookbehinds don't seem to be supported by regular gnu grep or grep -E, so you do need to use grep -P for them. https://www.gnu.org/software/grep/manual/grep.pdf https://www.gnu.org/software/grep/manual/grep.pdf
  • benji-york 4y ago
    Both grep and egrep are the same executable. bash-3.2$ diff `which grep` `which egrep` bash-3.2$
  • _moof 4y ago
    egrep is grep -E.