I am using the following regex
/[a-zA-Z0-9]+/i.test(value)
If I enter a space in the word, it passes.
I don't see where spaces are aloud in the regex, why is it passing?
views:
41answers:
2
+2
A:
Because you haven't anchored it.
For these sorts of tests, it's typically safer to make sure you don't have the negated character class:
/[^a-zA-Z0-9]/
Joe
2009-09-09 17:33:19
don't or do? isn't the ^ the negated symbol?
mrblah
2009-09-09 18:25:49
yes, ^ negates the character class -- but you need to flip the sense of the test (if ! (bad characters)) vs. (if (good characters)).
Joe
2009-09-10 00:07:48
+3
A:
You need to set the beginning and end bounderies so that the entire string must match the regular expression, otherwise it'll look for any match (which in this case is one or more of the characters specified).
Try this:
/^[a-zA-Z0-9]+$/i.test(value)
J-P
2009-09-09 17:33:21