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@ 2014-08-11T14:21:03Z

<?php

$arr_postcode_regexes = [
   'offshore' => [
      ['A', 'B', '3', '[0-8]'],         // AB30-38
      ['A', 'B', '4', '[1-9]'],         // AB41-49
      ['A', 'B', '5', '[0-6]'],         // AB50-56
      ['F', 'K', '1', '[789]'],         // FK17-19
      ['F', 'K', '2', '[01]'],          // FK20-21
      ['G', '8', '3'],                  // G83
      ['G', 'Y', '9'],                  // GY9
      ['H', 'S', '[1-9]'],              // HS1-9
      ['I', 'M', '[0-9]', '[0-9A-Z]?'], // IM
      ['I', 'M', '[0-9]', '[0-9A-Z]?'], // IV
      ['K', 'A', '2', '[89]'],          // KA27-28
      ['K', 'W', '[0-9]', '[0-9]?'],    // KW0-99
      ['P', 'A', '[2-9]', '[0-9]'],     // PA20-99
      ['P', 'H', '1', '[5-9]'],         // PH15-19
      ['P', 'H', '[2-9]', '[0-9]'],     // PH20-99
      ['T', 'R', '2', '[1-5]'],         // TR21-25
      ['Z', 'E', '[0-9]', '[0-9A-Z]?'], // ZE
   ],
   'ni' => [
      ['B', 'T', '[0-9]', '[0-9A-Z]?'], // ZE
   ]
];

// Turn the readable-ish map above into actual regexes
// It's important that all regexes match only full, valid postcodes, as prefix matching can be ambiguous.
foreach ($arr_postcode_regexes as $str_id => $arr_parts) {
   $arr_temp = [];

   foreach ($arr_parts as $arr_part) {
      $arr_temp[] = implode('\s*', $arr_part) . '\s*[0-9]\s*[A-Z]\s*[A-Z]';
   }

   $arr_postcode_regexes[$str_id] = '^\s*(' . implode('|', $arr_temp) . ')\s*$';
}

var_dump($arr_postcode_regexes);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["offshore"]=> string(738) "^\s*(A\s*B\s*3\s*[0-8]\s*[0-9]\s*[A-Z]\s*[A-Z]|A\s*B\s*4\s*[1-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|A\s*B\s*5\s*[0-6]\s*[0-9]\s*[A-Z]\s*[A-Z]|F\s*K\s*1\s*[789]\s*[0-9]\s*[A-Z]\s*[A-Z]|F\s*K\s*2\s*[01]\s*[0-9]\s*[A-Z]\s*[A-Z]|G\s*8\s*3\s*[0-9]\s*[A-Z]\s*[A-Z]|G\s*Y\s*9\s*[0-9]\s*[A-Z]\s*[A-Z]|H\s*S\s*[1-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|I\s*M\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z]|I\s*M\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z]|K\s*A\s*2\s*[89]\s*[0-9]\s*[A-Z]\s*[A-Z]|K\s*W\s*[0-9]\s*[0-9]?\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*A\s*[2-9]\s*[0-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*H\s*1\s*[5-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*H\s*[2-9]\s*[0-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|T\s*R\s*2\s*[1-5]\s*[0-9]\s*[A-Z]\s*[A-Z]|Z\s*E\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z])\s*$" ["ni"]=> string(59) "^\s*(B\s*T\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z])\s*$" }

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2020-03-21 RFC: Is_Literal - declined
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2016-05-29 array_change_keys() - withdrawn
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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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