Blacklist, case-insensitive regex for client-side validation

Asked Jan 03 '20 at 15:25

Active Jan 03 '20 at 15:25

Viewed 9 times

I'd like to implement some client-side validation for a case-insensitive, blacklisting of variations on a word. For example, if the word in question is Dog, a user should not be able to enter any variation of it:

dog
doG
dOg
dOG
Dog
DoG
DOg
DOG

Was trying to experiment with a negative lookahead, i.e., ^(?!.*(?:dog|doG|dOg|dOG|Dog|DoG|DOg|DOG)) but that seems too verbose and not generic enough.

asked Jan 03 '20 at 15:25

User 5842

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Does this answer your question? [Regex: ignore case sensitivity](https://stackoverflow.com/questions/9655164/regex-ignore-case-sensitivity) – Tanner Jan 03 '20 at 15:26
Convert user entered value to lowercase and then compare with `dog` – anubhava Jan 03 '20 at 15:26
@Tanner, would I still need to include all variations of said word, hardcoded into the expression? – User 5842 Jan 03 '20 at 15:28
Nope, your regex should be /dog/i – Tanner Jan 03 '20 at 15:29

Blacklist, case-insensitive regex for client-side validation

0 Answers0