Regex to disallow exact words only but allow extentions of the word

Asked Apr 06 '20 at 10:00

Active Apr 06 '20 at 10:06

Viewed 26 times

I was wondering if it was possible to get a regular expression which excludes certain words but is also inclusive of extentions of that word and at the same time not care about the case (so it wouldnt matter what case the word is in, the same principal would apply).

Say, I currently have a field with the following Regex validation: ^([a-zA-Z0-9 -]{2,30} but I want to limit this so the words "car" and "carrot" are disallowed (this applys for both capitals and lower case). All other values would be allowed such as "cars", "carpet" and "carrots". I basically only want to disallow the value if it is only "car" and "carrot" and I suppose if there is white space it should also be disallowed " car", "car " etc should also be disallowed.

Is this possible at all with regex?

Any help greatly appreciated.

Thanks.

edited Apr 06 '20 at 10:06

Wiktor Stribiżew

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asked Apr 06 '20 at 10:00

J145

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Check for word boundaries (`\b`), but that would still require special handling for the whitespace cases. – Robby Cornelissen Apr 06 '20 at 10:03
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Try `\b(?!car(?:rot)?\b)[a-zA-Z0-9-]{2,30}\b` https://regex101.com/r/BNnKqQ/1 – The fourth bird Apr 06 '20 at 10:06
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Maybe `(?i)^(?!.*\b(?:car|carrot)\b)[a-zA-Z0-9 -]{2,30}$`? See [demo](https://regex101.com/r/oRsynX/1). – Wiktor Stribiżew Apr 06 '20 at 10:07
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That would allow for something like `Carrot and cars` @WiktorStribiżew. Depending on language I think it might need to include the `(?i)`. Maybe: `^(?i)(?!.*\b(?:car|carrot)\b)[a-z0-9 -]{2,30}$`? – JvdV Apr 06 '20 at 10:09
@JvdV https://regex101.com/r/oRsynX/1 – Wiktor Stribiżew Apr 06 '20 at 10:10

Regex to disallow exact words only but allow extentions of the word

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