Problem in alphanumeric regular expression in javascript

Question

i want to validate user input for alphanumeric characters and for that im using

             var regex =  /^[a-zA-Z_0-9]$/;
             var asdfsfd = $('#vcr_LinkName').val();
             if (regex.test(asdfsfd)) {
                 alert("true");
             } else {
                 alert("false");                    
             }

but it always go into false condition what im doing wrong

Philipp Grathwohl · Accepted Answer · 2010-07-02 07:24:04Z

5

Your expression would only match one single character.

Try this:

^[a-zA-Z_0-9]+$

Or

^\w+$

regards

answered Jul 2, 2010 at 7:24

Philipp Grathwohl

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2 Comments

Fraz Sundal Over a year ago

If i want to allow space as well what should i do?

Philipp Grathwohl Over a year ago

Maybe there is a better solution, because this one allows tabs and linebreaks, too. But: ^(\w|\s)+$

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