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.

$str = '2323,321,329,34938,23123,54545,123123,312312';

Means to check if the string contains only Integers (Not decimal, no alphabats or anything else) separated by comma (,).

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";

RegEx Details:

• ^: Start
• \d+: Match 1+ digits
• (?:,\d+)*: Match comma followed by 1+ digits in a non-capturing group. Repeat this group 0 more times.
• $: End