PHP - preg_match and "Unknown modifier" error

php regex preg-match ereg
Oliver picture Oliver · Dec 6, 2011 · Viewed 19.4k times · Source

I had that test that worked fine :

if (ereg("([0-9]{2})[-./]([0-9]{2})[-./]([0-9]{4})[ ]([0-9]{2}):([0-9]{2}):([0-9]{2})", $dateToTest, $tab) == false)

and as ereg is deprecated, I have replaced that test with this one :

if (preg_match("/([0-9]{2})[-./]([0-9]{2})[-./]([0-9]{4})[ ]([0-9]{2}):([0-9]{2}):([0-9]{2})/", $dateToTest, $tab) == false)

But I get the following error :

Warning: preg_match() [function.preg-match]: Unknown modifier '.' in ..................

What is the problem and how may I solve it ?

Answer

PiTheNumber picture PiTheNumber · Dec 6, 2011

The problem is the delimiter / because you use it in your regexp again.

You have to escape it \/ or use another delimiter like @:

if (preg_match("@([0-9]{2})[-/.]([0-9]{2})[-/.]([0-9]{4})[ ]([0-9]{2}):([0-9]{2}):([0-9]{2})@", $dateToTest, $tab) == false)

See the example #3 in the Docu. There is also a manual about delimiters.

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