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[multitail] regex help

i would like to filter some entries from apache log.

i want to display
- all lines that match "client" like
  • [Thu Nov 09 08:53:11 2006] [error] [client] PHP Notice:  Undefined variable: toto in /sg2/instdev2/htdocs/V4/_FO_/lta.old/bench/test.php on line 7

- all lines that don't match "client" like
  • [Thu Nov 09 08:53:11 2006] [notice] child pid 13313 exit signal Segmentation fault (11)

I try several methods but without any success

such one regexp that should do both thing (match IP or line with this format "[date][level] message")
multitail -Em "(108.243|108.226)|^(\[.+?\]\s){2}(?!\[)" errors.log
this regexp does not even compile on multitail because i guess of negative look ahead assertion (it compile if i put \ before ? but match nothing anyway)
a another way without assertion
multitail -Em "(108.243|108.226)|^(\[.+?\]\s){2}[^\[]" errors.log
match nothing
i saw in documentation we can specify multiple regexp but it will do AND between them, and i need a OR to union

If i test those regexp in tools like regexBuddy or regexCoach, it works and match both kind of lines.

if you have any advice.



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