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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

In reply to Re: pcre grep by linuxer
in thread pcre grep by siffland

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