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Asked: 2026-06-08T23:27:12+00:00

I have to extract -(4)- from a log and have to use regex. my

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I have to extract -(4)- from a log and have to use regex.
my code is 

regex /(?!-)\d{1}+(?=-)/

and input is 

ASA-5510-6 : %ASA-4-106023: Deny udp src INTERNET:TEJ-BHARTI-ILL-2Mbps-

But with this regex it is also extracting similar other pattern (-5510-). I just want this(4) specfic four to be extracted.

and the whole log is 

2011-12-01T00:02:04.382593+05:18 Dec 01 2011 00:00:29 KOC-TEJ-AMEX-ASA-5510-6 : %ASA-4-106023: Deny udp src INTERNET:TEJ-BHARTI-ILL-2Mbps-ROUTER-LAN-IP/58653 dst TCS:VIS-SYSLOG-SERVER/514 by access-group "INTERNET_access_in" [0xc97c8100, 0x0]

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1 Answer

  1. Editorial Team

    Just put the %ASA in the lookbehind. Also the {1} is redundant, and the + matches more than one 4.

    /(?<=%ASA-)4(?=-)/g If you just want to match a 4.

    /(?<=%ASA-)\d+(?=-)/g If you want to match any group of digits.

    (I was unsure if you wanted to just match a four or anything where the 4 was in the input example)

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