I tried
https://regex101.com/r/VECPVu/1
((?<!must not be there )(.+))
with
tada test
and it matches whereas I don't want to. Why lookbehind doesn't work with (.+) and what's alternative then ?
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Are you trying to match a string that does not contain a certain string? – Wiktor Stribiżew Jun 01 '22 at 07:04
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I want to understand WHY first seems to me like spec of lookbehind is lacking :) – user310291 Jun 01 '22 at 07:34
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You have your pattern explanation at the link you shared. – Wiktor Stribiżew Jun 01 '22 at 07:35
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That's what I don't understand it is as if 2nd Group applies ignoring 1st Group rule. – user310291 Jun 01 '22 at 12:04
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1`(? – Wiktor Stribiżew Jun 01 '22 at 13:16
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@WiktorStribiżew thanks I feel I will never master regex it's over my head :) – user310291 Jun 01 '22 at 17:16
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Please study [this regex topic](http://www.rexegg.com/regex-lookarounds.html#stand_their_ground). – Wiktor Stribiżew Jun 01 '22 at 17:21