perl - How to match part of postfix log with regex? -


i need match following part of postfix log using grep.

aug 6 16:00:35 d1234567-002-e3 postfix/smtp[16032]: 3e60c7832

                                                    ^^^^^^^^^^

so far way i've been able using negative lookahead, that's not allowed in current implementation of grep (not using perl regex).

i assumed along lines of... (not complete solution)

.*:.*:.*:

$ s="aug 6 16:00:35 d1234567-002-e3 postfix/smtp[16032]: 3e60c7832"

for sed solution,

$ sed -e 's/.*]: //' <<< "$s"

for grep solution,

$ grep -op ']: \k.*' <<< "$s"

for awk solution,

$ awk '{print $nf}' <<< "$s"

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