Just PHP FUN 096.

a_valid_romans.php

<?php
# https://www.codewars.com/kata/58334362c5637ad0bb0001c2/ Filter valid romans.
function valid_romans($arr): array {
 return array_values(array_filter($arr,'valid'));
}
function valid($s){
  echo "Input: $s\n";
  $units = '((IX)|(IV)|(VI{0,3})|(I{1,3})){0,1}';
  $tens = '((XL)|(XC)|(LX{0,3})|(X{1,3})){0,1}';
  $hdrds = '((CD)|(CM)|(DC{0,3})|(C{1,3})){0,1}';
  $thsnds = '(M{1,4}){0,1}';
  $regex = '/^('.$thsnds.$hdrds.$tens.$units.')$/';
  echo "Regex: $regex\n";
  var_dump(preg_match($regex,"MDLXXXVI"));
  return (0 < strlen($s)) && (bool) preg_match($regex,$s);
}

just_php_fun_096.md

Just PHP FUN 096.

• https://www.codewars.com/kata/58143221f9588e340e00009f/
• https://www.codewars.com/kata/58334362c5637ad0bb0001c2/ Filter valid romans.

Started at 21:54 07.09.2020 Monday Sep. Finished at 23:05 07.09.2020 Monday Seap. (1hr 11minutes)

z_bangBang.php

<?php
# https://www.codewars.com/kata/58143221f9588e340e00009f/
function bangBang($history){
  $x = explode("\n",$history);
  $x = array_pop($x);
  return preg_replace('/^\s+\d+\s+/',"",$x);
}