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Re: pcre grep

by linuxer (Deacon)
on Jun 10, 2010 at 20:43 UTC ( #844119=note: print w/ replies, xml ) Need Help??


in reply to pcre grep

I think, you could have a look at the official perldoc to get information about Perl's regular expressions:

perlretut - Tutorial

perlrequick - Quick Reference

perlre - Regex documentation

And not to forget the pcre man pages:

http://www.pcre.org/pcre.txt

If you want/have to stick to pcregrep, I suggest something like:

pcregrep -v "^[^:]*:[^:]*:-?(1?\d?\d|20[0-4]):" /etc/passwd

It (simplified) assumes/uses:

  • the pattern is anchored at beginning of line (^)
  • "login name" field must not contain a colon
  • "password" field must not contain a colon
  • "UID" field:
    • leading optional "-"
    • grouped alternatives:
      • number between 0 and 199 OR
      • number between 200 and 204
  • don't care about the rest of the line


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