Question

How to check if a string contains only letters, numbers, underscores and dashes in PHP

Answer 1

function isValidString($s) {
    $pattern = '/^[A-Za-z0-9_-]*$/';
    
    return preg_match($pattern, $s);
}

$s1 = "-abc_123-";
echo isValidString($s1) ? "yes\n" : "no\n";

$s2 = "-abc_123-(!)";
echo isValidString($s2) ? "yes\n" : "no\n";


  
/*
run:
  
yes
no
 
*/

 

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