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REGEXP returns false for special characters

I am not very good at regexp but hope someone can explain to me better, I found this in the code I am debugging. I wonder why I was always wrong about this scenario.

I know this \p{L}

matches one code point in the letter category. 0-9

is numeric.

$regExp = /^\s*
     (?P([0-2]?[1-9]|[12]0|3[01]))\s+
     (?P\p{L}+?)\s+
     (?P[12]\d{3})\s*$/i;

    $value = '12 Février 2015' ;
    $matches = array();

    $match = preg_match($regExp, $value, $matches);

More info, I came up with the following:

$match = preg_match("/^\s*(?P<monthDay>([0-2]?[1-9]|[12]0|3[01]))\s+(?P<monthNameFull>\p{L}+?)\s+(?P<yearFull>[12]\d{3})\s*$/i", "18 Février 2015");
var_dump($match); //It will print int(0).

But if a value 18 February 2015

, it will print int (1). Why is this so? Suppose you want to return 1 on both values, because it \p{L}

will accept Unicode characters.

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4 answers


Figured out the fix, use / u instead of / i.

$match = preg_match("/^\s*(?P<monthDay>([0-2]?[1-9]|[12]0|3[01]))\s+(?P<monthNameFull>\p{L}+?)\s+(?P<yearFull>[12]\d{3})\s*$/u", "18 Février 2015");
var_dump($match); //It will print int(1).


Thanks everyone for the help

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$regExp = '/^\s*(?P<y>([0-2]?[1-9]|[12]0|3[01]))\s+(?P<m>\p{L}+?)\s+(?P<d>[12]\d{3})\s*$/usD';

$value = '12 Février 2015';
$matches = array();

$match = preg_match($regExp, $value, $matches);

var_dump($matches);


You always need to use <name>

with (?P

unless you want errors ... And on multi-line unicode strings, you need flags usD

. It's easy to remember as the US dollar ...

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No named groups are required, and the syntax for them seems to be wrong anyway. So this cleaned up version should work:

/^ \s*([0-2]?[1-9]|[12]0|3[01])\s+ \p{L}+?\s+ [12]\d{3}\s* $/i

A sample of the day of the month would also be clearer because:

(0?[1-9]|[12][0-9]|3[01])

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Use the modifier u

for unicode:

$regExp = /^\s*
   (?P<monthDay>([0-2]?[1-9]|[12]0|3[01]))\s+
   (?P<monthNameFull>\p{L}+?)\s+
   (?P<yearFull>[12]\d{3})\s*$/u;
//                      here __^

The modifier i

is optional, \p{L}

case insensitive.

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