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<?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 git.master, git.master_jit, rfc.property-hooks
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

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