正则表达式以YYYY-MM-DD格式匹配日期

Question

I have a regular expression in PHP that looks for the date in the format of YYYY-MM-DD

What I have is: [\d]{4}-[\d]{2}-[\d]{2}

I'm using preg_match to test the date, the problem is that 2009-11-10 works, but 2009-11-1033434 works as well. It's been awhile since I've done regex, how do I ensure that it stops at the correct spot? I've tried doing /([\d]{4}-[\d]{2}-[\d]{2}){1}/, but it returns the same result.

Any help would be greatly appreciated.

Answer 1

What you need is anchors, specifically ^ and $. The former matches the beginning of the string, the latter matches the end.

The other point I would make is the [] are unnecessary. \d retains its meaning outside of character ranges.

So your regex should look like this: /^\d{4}-\d{2}-\d{2}$/.