Question

I have a text to validate using regex,

Text field is allowed to have all the characters a-z and 0-9 except for alphabets (i,o,q).

I tried something like this but cannot get it to work '/[^(oOiIqQ)]/'

Answer 1

A simple way for exclusions like this is to use negative lookahead. State what you want:

/^(?:[a-z0-9])+\z/i

Then exclude the items you don’t want:

/^(?:(?![ioq])[a-z0-9])+\z/i