Regex to match any single alphabet in string php -

i hate code. take zipcode html pages verifies if zipcode usa or canada.

<?php  $contents = file_get_contents('853755.html');  preg_match_all('/<td id="u_zipcode">(.*?)<\/td>/s', $contents, $matches);  $data = implode("|",$matches[0]); $string = str_replace(' ', '', $data);   if(preg_match('/^[1-9][0-9]*$/',$string)){     echo "canada";     }     else     {         echo "usa";         }  ?> 

i tried had search solution it. can't find solution. tried regex should contain numbers not single alphabet. doesn't seem work in way. zipcode given in format,

usa: 97365 usa: 97365-97366 canada: j8n7s1 canada: n2l5y6 

kindly me solution. thanks

since there can 1 element particular id, don't need use preg_match_all(), can use preg_match().

preg_match('/<td id="u_zipcode">(.*?)<\/td>/s', $contents, $match); 

then don't need use implode(). part matches capture group in element 1 of match array.

$string = str_replace(' ', '', $match[1]);  if(preg_match('/^\d{5}(-\d{4})?$/',$string)) {     echo "usa"; } else {     echo "canada"; }