Regexp pattern - please help

[notset]

I want to get only 4 letters .com domain names which contain only specific letters. How to do that with regexp?

My pattern:

/(a|b|c|d|e|f|g|h|i|l|m|n|o|p|r|s|t){4}.(com)/i

What is wrong with it?

[Kudose]

try

#[a|b|c|d|e|f|g|h|i|l|m|n|o|p|r|s|t]{4}.com#i

[notset]

Kudose wrote:

try

#[a|b|c|d|e|f|g|h|i|l|m|n|o|p|r|s|t]{4}.com#i

The same - returns everything as "TRUE".

[NogDog]

It might be helpful to see it in context, in case it's a code logic error and not a regex error. In any case, I don't see an obvious problem with the regex, though it could be shortened a bit to:

/[a-il-pr-t]{4}\.com/i

PS: depending on the exact requirement, you may need some sort of assertion or pattern at the start of the pattern to make it match only if the character preceding the 4 letters is not another alpha/numeric or other possible domain name character, e.g.:

/\b[a-il-pr-t]{4}\.com/i