[a-zA-Z0-9]({[a-zA-Z0-9]*})+:? . For example: h{help}f{filename}{fname}:
The first char is what is returned when met (single char option char).
[a-zA-Z0-9]({[a-zA-Z0-9]*})+:? . For example: h{help}f{filename}{fname}:
The first char is what is returned when met (single char option char).