PHP regex optional non-matching groups? -

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i'm trying make date regex allows years 1900 2099, 19 or 20 optional.

i'm there, can't find way allow 19 or 20 optional part. here's i've got:

(?:20)(?:19)?[0-9][0-9]

testing results:

string    preg_match     ok?  ======    ==========     =========== 55         yes             yes 1955       yes             yes 2055       yes             yes 201955     yes             no

can out?

this it:

^(?:19|20)?\d{2}$

it says:

^ = start of string

(?:19|20)? = match 19 or 20 without capturing, 0 or 1 times

\d{2} = 2 decimal digits

$ = end of string


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