$re = '/^\'\s*(SELECT)[^\']*(FROM)[^\']*\'|^"\s*(SELECT)[^"]*(FROM)[^"]*"/m';
$str = '"SELECT * FROM table"
"
SELECT * FROM table"
"""
Use this query here: "SELECT * FROM table"
"""
SELECT * FROM table';
$subst = "";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php