This is javascript, but a virtually identical regex is failing in PHP too, so I don't think it's language specific
var r = new RegExp(
"^(:19|20)?[0-9][0-9]" // optional 19/20 start followed by 2 numbers
+ "-" // a hyphen
+ "(:0?[1-9]|1[0-2])" // optional 0 followed by 1-9, or 10, 11, 12
+ "-" // a hyphen
+ "(:3[01]|[12][0-9]|0?[1-9])$" // you get the idea.
);
r.test("2008-07-01"); // == false
What on earth am I missing?
From stackoverflow
-
I think your non-capturing blocks should be e.g.
(?:19|20)
rather than(:19|20)
nickf : that was it, cheers. -
Correct; your regular expression would actually work with "?:"
"?" when used a prefix indicates that you're going to do something about capturing. Either not capture the block (":"), capture ahead ("="), behind ("<="), etc.
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