Regex with jquery

Question

I am trying to perform a few check but REGEX I just don't get the hang of. I am trying to check firstly for 3 characters and secondly want to perform a check that there are no numeric characters. The code is below and finally could some one answer is the regex syntax same in every language?

$(document).ready(function() {
    var name=$('#firstname');
    function validateName() {
        //function nameCheck() {
        if (name.val().length <=2) {
            name.addClass('error'); 
            $(".hidden_f").html("First Name must be 3 letters!"); 
        } else if ($("#firstname.").val().match('[a-z]')) {
            $(".hidden_f").html("No numbers!");     
        }
    }
    name.keyup(validateName);
});

And also if possible could some one give me a few examples so I can try and learn regex cheers!

Always take a look at other questions: http://stackoverflow.com/questions/345194/regular-expression-matching-in-jquery. — Erick Petrucelli, May 06 '11 at 22:52

score 2 · Answer 1 · answered May 06 '11 at 22:49

2

There are a few slightly different flavors of RegExp, but for the most part, RegExp is the same in every language with minor differences.

I think this is the best resource for RegExp : http://www.regular-expressions.info/

it's packed with articles and examples, truly an amazing website.

To match a phrase with 3 or more characters and no numeric characters you could use

var re = /[^0-9]{3,}/i

That should work.

answered May 06 '11 at 22:49

jesse reiss

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fromcomment: "want to perform a check that there are no numeric characters" – jesse reiss May 06 '11 at 22:55

score 1 · Answer 2 · answered May 07 '11 at 01:38

You're passing a string, not a regexp, as the argument of match, so it's trying to Mach the sequence in the string literally as it is. Regexps are delimited by / / or created with new Regexp(escaped string).

As an aside, if you don't need the matches, you should use regexp.test(input) instead.

score 0 · Answer 3 · answered May 06 '11 at 22:48

0

Firstly you seem to have an error in the selector $("#firstname.") should read $("#firstname")

As for regex - for 3 letters (no numbers) you can use match(/[a-zA-Z]{3}/)

answered May 06 '11 at 22:48

Billy Moon

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Regex with jquery

3 Answers3