Online PHP editor | output for L1HW2

@ 2014-08-11T14:29:31Z

<?php

$arr_postcode_regexes = [
   'uk' => [ // Should match any *valid* UK postcode
      ['[A-Z]', '[A-Z]?', '[0-9]', '[0-9A-Z]?'],
   ],
   '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('|', $arr_temp) . ')\s*$';
}

$tests = [
    'M65GQ',
    'G83GH',
    'G833GH',
    'IM14GF',
    'TR207HG',
    'TR217HG',
    'TR21HG',
    'BT12HG',
];

foreach ($tests as $test) {
    echo "$test:\n";

    foreach ($arr_postcode_regexes as $name => $expr) {
        echo "  $name: " . (preg_match('/' . $expr . '/i', $test) ? 'yes' : 'no') . "\n";
    }

    echo "\n";
}
var_dump($arr_postcode_regexes);

Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: M65GQ: uk: yes offshore: no ni: no G83GH: uk: yes offshore: no ni: no G833GH: uk: yes offshore: yes ni: no IM14GF: uk: yes offshore: yes ni: no TR207HG: uk: yes offshore: no ni: no TR217HG: uk: yes offshore: yes ni: no TR21HG: uk: yes offshore: no ni: no BT12HG: uk: yes offshore: no ni: yes array(3) { ["uk"]=> string(68) "^\s*([A-Z]\s*[A-Z]?\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z])\s*$" ["offshore"]=> string(738) "^\s*(A\s*B\s*3\s*[0-8]\s*[0-9]\s*[A-Z]\s*[A-Z]|A\s*B\s*4\s*[1-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|A\s*B\s*5\s*[0-6]\s*[0-9]\s*[A-Z]\s*[A-Z]|F\s*K\s*1\s*[789]\s*[0-9]\s*[A-Z]\s*[A-Z]|F\s*K\s*2\s*[01]\s*[0-9]\s*[A-Z]\s*[A-Z]|G\s*8\s*3\s*[0-9]\s*[A-Z]\s*[A-Z]|G\s*Y\s*9\s*[0-9]\s*[A-Z]\s*[A-Z]|H\s*S\s*[1-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|I\s*M\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z]|I\s*M\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z]|K\s*A\s*2\s*[89]\s*[0-9]\s*[A-Z]\s*[A-Z]|K\s*W\s*[0-9]\s*[0-9]?\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*A\s*[2-9]\s*[0-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*H\s*1\s*[5-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|P\s*H\s*[2-9]\s*[0-9]\s*[0-9]\s*[A-Z]\s*[A-Z]|T\s*R\s*2\s*[1-5]\s*[0-9]\s*[A-Z]\s*[A-Z]|Z\s*E\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z])\s*$" ["ni"]=> string(59) "^\s*(B\s*T\s*[0-9]\s*[0-9A-Z]?\s*[0-9]\s*[A-Z]\s*[A-Z])\s*$" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/L1HW2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/L1HW2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/L1HW2 on line 3
Process exited with code 255.

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