Regex Expression Conditional Validation In JavaScript

Actually i am trying to add Validation to textbox field in ASP.NET.The validation is like first 2 characters must be Alphabets and last two characters Numeric in a max length of 4..Here is the code block function IsValidate(evt) { var charCode = (evt.which) ? evt.which : evt.keyCode; var Con = String.fromCharCode(charCode); var exp= new RegExp("[A-Za-z]{2}[0-9]{2}"); if(exp.match(Con)) { return true; } else { return false; } } Any help will be well appreciated...
Why are you converting the keycode pressed to a char and then validating that. I don't think that contains the text in the textbox, does it?

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