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@ 2014-10-28T20:48:11Z

<?

$x = 'bob';

echo preg_match('[0-9a-zA-Z]', $x);

echo preg_match('~[0-9a-zA-Z]~', $x);

echo preg_match('~[0-9a-zA-Z]+~', $x);

echo $x;

?>

Output
Performance
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References
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preg_match: documentation ( source)

preferences:dark modelive preview

30.35 ms | 402 KiB | 5 Q