For some reason I want to avoid names beginning with numbers. All my filenames can be used as an identifier (except the extension part). i.e. [a-zA-Z][0-9a-zA-

For some reason I want to avoid names beginning with numbers. All my filenames can be used as an identifier (except the extension part). i.e. [a-zA-Z][0-9a-zA-Z_]+\.[a-z0-9]+