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<?php $line = "string string 4-string string string 12345 string 678249 string "; if (preg_match('/\b\d{4,}\b/', $line, $matches)) { var_dump($matches); }
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(5) "12345" }

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