checking whether a string contains any special character or string in javascript

Question

I want to check whether a string has any special characters or not. I am using this script:

var name = $("#name").val(); if(name.match(/[_\W]0-9/)) { alert('Not A Name'); }

It doesn't alert even when name="sas23"

for your purpose what are NOT special characters? (what characters are allowed?) — Fabrizio Calderan
– Fabrizio Calderan, Commented Jan 15, 2013 at 13:59

marekful · Accepted Answer · 2013-01-15 14:04:08Z

5

instead /[_\W]0-9/ your regex literal should be /[_\W0-9]/

answered Jan 15, 2013 at 14:04

marekful

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Comments

Alex · Accepted Answer · 2013-01-15 14:06:38Z

Your function should be like this:

var name=$("#name").val(); if(!isLetters(name)) { alert('Not A Name'); } function isLetters(str) { return /^[a-zA-Z]+$/.test(str); }

jbabey · Accepted Answer · 2013-01-15 14:07:53Z

You should always take a whitelist approach when creating regular expressions. That means specify which characters are allowed, and ban everything else by default. If all you want is letters, then only allow letters:

var name=$("#name").val(); if(!name.match(/^[a-z]+$/i)) { alert('Not A Name'); }

Try it out.

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