Need help with Regular Expression

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   Guys,

I am tyring to use regular expression for validation of files...

Here is what regular expression MUST do...

All files must start with an alphanumeric character (0-9, a-z, A-Z)
All files must end with xls, doc, ppt.

Here is what I have I gotten so far...

^[0-9a-zA-Z]{1} > this will take care of the first caracter to be alphanumeric.

I am having problem with the extension of the file. I was thinking if I do [xls,doc,ppt]$ it will work... But it doesn't....

I want help creating one expression that will handle both in one notch... If needed I can do a second validation, but need the expression to validate the ending...

Please advise,
Shrini