RegEx/Javascript validation: Don't allow comma as a valid character

Posted by baldwingrand on Stack Overflow See other posts from Stack Overflow or by baldwingrand
Published on 2010-05-18T20:21:10Z Indexed on 2010/05/18 20:30 UTC
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JavaScript

I'm doing Javascript validation on my number fields. I'm using RegEx to do this - first time RegEx user. I need the user to only enter numbers and decimals, but not commas. (i.e. 3600.00 is okay, but 3,600.00 is not). I can't figure out how to eliminate the commas as an accepted character. Any help is appreciated. Thanks!

                        var filter = /^([0-9])/;

                            if (!filter.test(txtItemAmount.value)) 
                            {
                                msg += "Item amount must be a number.\n";
                                txtItemAmount.focus
                            }

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