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@ 2017-07-11T12:08:01Z

<?php

function extractPatterns(array $rules) : array
{
    $postcodes = [];

    foreach ($rules as $rule) {
        if (preg_match('/^([A-Z]{1,2})([0-9]{1,2})-([0-9]{1,2})$/', trim($rule), $matches)) {
            for ($i = $matches[2]; $i <= $matches[3]; $i++) {
                $postcodes[] = sprintf('%s%s', $matches[1], $i);
            }
            continue;
        }
        if (preg_match('([A-Z]{1,2}[0-9]{1,2})', $rule, $matches)) {
            $postcodes[] = $matches[0];
            continue;
        }
        if (preg_match('[A-Z]{1,2})', $rule, $matches)) {
            $postcodes[] = $matches[0];
            continue;
        }
    }

    return $postcodes;
}


$tests = [
    [
        'rules'     => 'AB41-56, FK19-21, NG12',
        'expected'  => [
            'AB41',
            'AB42',
            'AB43',
            'AB44',
            'AB45',
            'AB46',
            'AB47',
            'AB48',
            'AB49',
            'AB50',
            'AB51',
            'AB52',
            'AB53',
            'AB54',
            'AB55',
            'AB56',
            'FK19',
            'FK20',
            'FK21',
            'NG12'
        ]
    ],
    [
        'rules'     => 'HU1, W1-5',
        'expected'  => [
            'HU1',
            'W1',
            'W2',
            'W3',
            'W4',
            'W5'
        ]
    ]
];

foreach ($tests as $test) {
    assert(extractPatterns(explode(',', $test['rules'])) == $test['expected']);
}

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.4, 8.3.6
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

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168.8 ms | 402 KiB | 173 Q