How to make a group of regex characters optional? -

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i'm trying create regex allows unicode letters, digits, -, , apostrophes first character letter or number, while subsequent characters can letters, numbers, -, or '. think regex works fine except in case user enters single letter or number. there anyway make 2+ characters optional? below current regex:

/^[\p{l}0-9]+[-\'\p{l}0-9']+$/u

thanks!

-eric

without using ? can use: 

/^[\p{l}0-9]+[-\'\p{l}0-9']*$/u

to allow single alpha-numeric in input since [-\'\p{l}0-9']* means 0 or matches.


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