3v4l.org

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<?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 for 5.6.38, 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
TeSt Te s-t

preferences:
103.62 ms | 1482 KiB | 4 Q