Online PHP editor | output for 2mWEk

@ 2018-02-05T09:50:33Z

<?php

$strings = [
    "a1a2a3a4aaaa",
    "a3333aaaaaaa",
    "a1a2a3aaaaa2",
    "a1a2a3",
    "a222",
    "aaaa",
    "a2aa",
    "f2fdfgdd",
    "w333rrrrrrr4",
    "rrrrrrrr4444",
    "r22rrrrrrrrr",
    "g4fff333ffff",
    "333333333333",
    "1111",
    "1aaa",
    "1aaaaaaaaaaa",
    "1a2aaaaaaaaa",
    "a1aaaaaaaaaaa",
    "a11111aaaaaa",
    "a122a3aaaaa2",
    "a1a2a3a4a5aa"
];
$pattern = "/^[a-z](?=(?:[a-z]*\d){0,4}(?![a-z]*\d))(?=[a-z\d]{3,11}$)[a-z\d]+$/";
foreach ($strings as $string) {
    echo $string . " ==> " . preg_match($pattern, $string) . PHP_EOL;
}

Output for 5.4.45, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13: a1a2a3a4aaaa ==> 1 a3333aaaaaaa ==> 1 a1a2a3aaaaa2 ==> 1 a1a2a3 ==> 1 a222 ==> 1 aaaa ==> 1 a2aa ==> 1 f2fdfgdd ==> 1 w333rrrrrrr4 ==> 1 rrrrrrrr4444 ==> 1 r22rrrrrrrrr ==> 1 g4fff333ffff ==> 1 333333333333 ==> 0 1111 ==> 0 1aaa ==> 0 1aaaaaaaaaaa ==> 0 1a2aaaaaaaaa ==> 0 a1aaaaaaaaaaa ==> 0 a11111aaaaaa ==> 0 a122a3aaaaa2 ==> 0 a1a2a3a4a5aa ==> 0
Output for 5.3.6: Parse error: syntax error, unexpected '[' in /in/2mWEk on line 3
Process exited with code 255.

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