Question

I have form where user submits field. Field can have letters, numbers, and punctuation. But I want to check to make sure that at least 3 of the characters are letters. How can I regex that?

For example,

$string = "ab'c";

And I need something like,

if (preg_match("/[a-z]{3}/i", $string))
    print "true";
else
    print "false";

That string has three letters, even though it has an apostrophe. It should test true. But for some reason, that tests false right now.

Any help?

Answer 1

How about a case insensitive match on:

([a-z][^a-z]*){3}

Looks for 3 groups of a letter, and any number of non letters.