Posted by Bosconian on 07/19/06 04:45

I need a regular expression to validate characters for a given file name. I
want to limit valid characters to the following:

a-z
A-Z
0-9
underscores
hyphens
white spaces

The file name must end with a period and a 3-character extension.

I also want to prevent repeat underscores, hyphens and white spaces.
Example: "__", "--" and " " would all be invalid.

I found this example:

^[a-zA-Z0-9_\s-]+$

This comes close, but it allows repeat underscores, hyphens and white
spaces. It also uses "\s" which allows carriage returns, linefeeds, tabs,
etc.

Any help would be greatly appreciated.

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