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Oh and I assumed your lines where separate samples, otherwise, yes, using group to get the thing, and flags (e.g. g and m for multiple and multi-line matches) So your Javascript pattern could then be like const regex = /(\btest\b)/gm; in JS

Sébastien Portebois your regex will also match one of the "should not match" cases...

Marco Alka oh you mean <spaces> test ? To be honest I wondered how I should interpret this (because it was in this list, but test was in yellow there, so I understood this as we should catch the test but not the spaces ..... All to say that, as usual, requirements based on examples are always a recipe for bad things (I so often push back on our so-called tech-product specialist who always explains the features we need to build only with examples.... this drives me crazy! But that’s another story ;-)

In that case I’d go for a generic way to check for repetition with \1 and restrict it for lines, e.g:

^\W?(test)\W?( \1)?$ (railroad diagram tinyurl.com/y3etlp3q )

Sébastien Portebois It's in yellow because Hashnode's code highlighting is bananas 😂

Ahah I should have noticed it.... which is a good reminder to not answer anything on the internet before to drink the first coffee in the morning =D (yes it’s still early on this side of the Atlantic)