What potential issue can arise when using preg_match() in PHP?

One potential issue that can arise when using preg_match() in PHP is that it may return false if an error occurs during the regular expression evaluation. To solve this issue, you can check the return value of preg_match() and handle the error accordingly by using strict comparison (===) to check for false. 

$pattern = '/[0-9]+/';
$string = 'abc123def';

if (preg_match($pattern, $string) === false) {
    echo 'Error in regular expression evaluation';
} else {
    echo 'Regular expression matched successfully';
}

Keywords

preg_match PHP regular expressions syntax error pattern matching

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