Strip punctuation from a string with regex using PHP

Handy little snippet.

// To keep letters & numbers
$string = preg_replace('/[^a-z0-9]+/i', '_', $string);

// To keep letters only
$string = preg_replace('/[^a-z]+/i', '_', $string); 

// To keep letters, numbers & underscore
$string = preg_replace('/[W]+/', '_', $string);



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