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@ 2018-01-21T12:27:33Z

<?php

$strings = [
    "TeSt",
    "Te s-t",
    "",
    "Te4St"
];
foreach ($strings as $string) {
    if(preg_match('#^[a-z -]+$#i', $string, $matches)){
        echo $matches[0] . PHP_EOL;
    }
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

26.56 ms | 404 KiB | 5 Q