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  1. <?php
  2.  
  3. $strs = ['c0', 'c0-3', 'c0+3', 'c0 & 9', 'c0A'];
  4. $terms = ['episode', 'chapter', 'ch', 'ep', 'c', 'e', ''];
  5.  
  6. $chapter_main_rx = "(?|" . implode("|", array_map(function ($term) {
  7. 	return strlen($term) > 0 ? "(" . substr($term, 0, 1) . ")(" . substr($term, 1) . "s?)": "()()" ;},
  8.   $terms)) . ")\s*";
  9. $chapter_aux_rx = "(?:" . implode("|", array_map(function ($term) {
  10. 	return strlen($term) > 0 ? substr($term, 0, 1) . "(?:" . substr($term, 1) . "s?)": "" ;},
  11.   $terms)) . ")\s*";
  12.  
  13. $reg = "~$chapter_main_rx((\d+(?:\.\d+)?(?:[A-Z]\b)?)(?:\s*(?:[,&+-]|and)\s*(?:$chapter_aux_rx)?(?4))*)~ui";
  14.  
  15. foreach ($strs as $s) {
  16.     if (preg_match($reg, $s, $m)) {
  17.         $p3 = preg_replace_callback(
  18.             "~(\d*(?:\.\d+)?)([A-Z]?)\s*-\s*(?:$chapter_aux_rx)?|(\d+(?:\.\d+)?(?:[A-Z]\b)?)(?:\s*(?:[,&+]|and)\s*(?:$chapter_aux_rx)?(?1))*~ui", function($x) use ($chapter_aux_rx) {
  19.                 return strlen($x[3]) > 0 ? buildNumChain(preg_split("~\s*(?:[,&+]|and)\s*(?:$chapter_aux_rx)?~ui", $x[0])) 
  20.                 : (strlen($x[1]) > 0 ? ($x[1] + 0) : $x[1]) . (strlen($x[2]) > 0 ? ord(strtolower($x[2])) - 96 : "") . "-";
  21.             }, $m[3]);
  22.         print_r(["original" => $s, "found_match" => trim($m[0]), "converted" => $m[1] . $p3]);
  23.         echo "\n";
  24.     } else {
  25.     	echo "No match for '$s'!\n";
  26.  
  27.     }
  28. }
  29.  
  30. function buildNumChain($arr) {
  31.     $ret = "";
  32.     $rngnum = "";
  33.     for ($i=0; $i < count($arr); $i++) {
  34.         $val = $arr[$i];
  35.         $part = "";
  36.         if (preg_match('~^(\d+(?:\.\d+)?)([A-Z]?)$~i', $val, $ms)) {
  37.         	$val = $ms[1];
  38.         	if (!empty($ms[2])) {
  39.         		$part = ' part ' . (ord(strtolower($ms[2])) - 96);
  40.         	}
  41.         }
  42.         $val = $val + 0;
  43.         if (($i < count($arr) - 1) && $val == ($arr[$i+1] + 0) - 1) {
  44.             if (empty($rngnum))  {
  45.                 $ret .= ($i == 0 ? "" : " & ") . $val;
  46.             }
  47.             $rngnum = $val;
  48.         } else if (!empty($rngnum) || $i == count($arr)) {
  49.             $ret .= '-' . $val;
  50.             $rngnum = "";
  51.         } else {
  52.             $ret .= ($i == 0 ? "" : " & ") . $val . $part;
  53.         }
  54.     }
  55.     return $ret;
  56. }
Success #stdin #stdout #stderr 0.03s 23852KB
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stdin
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Standard input is empty
stdout
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Array
(
    [original] => c0
    [found_match] => c0
    [converted] => c0
)

Array
(
    [original] => c0-3
    [found_match] => c0-3
    [converted] => c0-3
)

Array
(
    [original] => c0+3
    [found_match] => c0+3
    [converted] => c0 & 3
)

Array
(
    [original] => c0 & 9
    [found_match] => c0 & 9
    [converted] => c0 & 9
)

Array
(
    [original] => c0A
    [found_match] => c0A
    [converted] => c0 part 1
)
stderr
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PHP Notice:  Undefined offset: 3 in /home/EAY4Hr/prog.php on line 19
https://ideone.com/gzaRA9
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
secret

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