Python regex match, but exclude if regex match

Question

I'm trying to write a regex for re.search that can match a string as long as the word prod exists anywhere in the text (.*prod.*). however, it should fail the match if the string should have the word orange anywhere in it.

web-prod-green # should match
web-prod-orange # should fail to match
web-orange-green # should fail to match
orange-prod-green # should fail to match

How can i do this? Thanks.

Why do you want to use regex? Why not just if "prod" in text and "orange" not in text? — zvone
– zvone, Commented Dec 11, 2022 at 8:46

Tim Biegeleisen · Accepted Answer · 2022-12-11 08:45:44Z

2

We could use a negative lookahead to exclude the presence of orange:

^(?!.*\borange\b).*\bprod\b.*$

Demo

answered Dec 11, 2022 at 8:45

Tim Biegeleisen

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2 Comments

sebastianwth Over a year ago

Thanks tim. Is there an or operator where I can say either orange, or green or blue.

Tim Biegeleisen Over a year ago

For orange, green, or blue, use: ^(?!.*\b(?:orange|green|blue)\b).*\bprod\b.*$

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