Check if String has only Integers separated by comma in PHP

Question

I am really empty at Regex side and that\'s why couldn\'t get how to make a Regex in PHP which checks if the string has this particular sequence of characters.

Answer 1

You can use this regex:

'/^\d+(?:,\d+)*$/'

Code:

$re = '/^\d+(?:,\d+)*$/';
$str = '2323,321,329,34938,23123,54545,123123,312312'; 

if ( preg_match($re, $str) )
    echo "correct format";
else
    echo "incorrect format";