Just PHP FUN 089.

isValid_Eremin_updated.php

<?php
# https://www.codewars.com/kata/515decfd9dcfc23bb6000006 IP Validation.
# Updatd solution from https://www.codewars.com/users/eremin
# Nice solution. But \d{1,2} will match 01 but in the description this is an invalid value for an octet: 
# Note that leading zeros (e.g. 01.02.03.04) are considered invalid.
# To avoid leading zero I changed solution a little bit add one digit case, and range from 1 till 9 with digit \d|[1-9]\d.
function isValidIP(string $str): bool
{
    $r = '(\d|[1-9]\d|1\d{2}|2([0-4]\d|5[0-5]))';
    return (bool)preg_match("/^$r\.$r\.$r\.$r\$/", $str);
}

isValidIP.php

<?php
# https://www.codewars.com/kata/515decfd9dcfc23bb6000006 IP Validation.
function isValidIP(string $str): bool
{
  echo "Input: $str \n";
  $x = explode(".",$str);
  if(4 != count($x)) return false;
  foreach($x as $s){
    if('0' == $s) continue;
    if(! preg_match('/^[0-9]+$/',$s)) return false;
    if('0' == $s[0]) return false;
    if(255 < intval($s)) return false;
  }
  return true;
}

just_php_fun_089.md

Just PHP FUN 089.

• https://www.codewars.com/kata/515decfd9dcfc23bb6000006 IP Validation.

Started at 23:01 29.08.2020 Saturday Aug.
Finished at 23:08 29.08.2020 Saturday Aug. (0hrs 7minutes)