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@ 2019-11-20T10:57:32Z

<?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
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

29.82 ms | 405 KiB | 5 Q