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Asked: 2026-06-12T03:52:31+00:00

I have a string of the format: PATTERN or abcPATTERNdef or PATTERN or <<[TEST].[PATTERN]>>

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I have a string of the format:

PATTERN or abcPATTERNdef or PATTERN or <<[TEST].[PATTERN]>>

I have created a regular expression (in JavaScript) as (^PATTERN)|([^\[]PATTERN) which is returning the first 3 occurrences while ignoring the last one, however I also seem to be getting the preceding character in the returned matches:

“PATTERN”, “cPATTERN” and ” PATTERN”

What I need are the matches without the preceding character.

I’m new to regular expressions and apologize if the question reflects that.

Any help would be greatly appreciated.

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1 Answer

  1. Editorial Team

    JavaScript doesn’t have good support for lookbehinds, but if your format is going to remain the same, you can try something like this:

    PATTERN(?!])

    It matches all occurrences of “PATTERN” that are not followed by a ].

    Let me know if this isn’t the case, and I will update my answer to include the check for the opening [.

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