[Javascript] RegEx for validating a file name

[shawn.milo at gmail.com (Shawn Milo)]

You can try this:

^[a-zA-Z0-9]+\.[a-zA-Z]{3}$

There may be a more elegant way to do it, but this should work.

Shawn



On 5/19/05, Rod Coate <rod.coate@xxxxxxxxxxxxxxxxxxxx> wrote:
> Hi,
> I am tring to use a regular expression to validate user input (a file name) on my html using javascript.
> 
> What I have tried so far is:
> =====================================================
> <script type="text/javascript">
> function validateFileName(fileName){
>         var validReg="\W+\.\W{3}$";
>         var regex= new RegExp(validReg);
>         return regex.test(fileName);
> }
> 
> function checkFileName(f){
>         var fileName=f.value;
>         if(!validateFileName(fileName)){
>                 alert("file name is not valid");
>                 f.value="";
>                 document.myForm.fileName.focus();
>         }
> }
> 
> </script>
> 
> <form action="" name="myForm" method="post">
>         <input type="text" name="fileName" value="" onChange="checkFileName(this);">
> </form>
> =====================================================
> but the regex does not seem to work correctly. What I want is to make sure that fileName is alphanumeric, contains only one . and has three alpha characters after the .
> 
> It also should not contain things like \/*?| ect or any spaces.
> 
> Is anyone able to help with the regex to get it to work? (I have tried google, but can't find what I am looking for).
> 
> Cheers,
> Rod.
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