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phpregexleading-zero

Count or Return Leading 0's in PHP Regex

If I have

$num = '00000567';

I want to use PHP's preg match or split to split off the 0's so I can count them or count the 0's and have the regex return the variable. Can anyone help me out as the net have very few hits about leading 0's and mostly they're about removing them

Solution

  • You can just replace all non-zero to empty string:

    $repl = preg_replace('/[^0]+/', '', $num);
//=> 00000

    OR use preg_match to match zeroes only:

    if (preg_match('/^0+/', $num, $m))
   echo $m[0];