<?php
$string = " asc ";
$pattern = "|( )(.*?)( )|i";
$replacement = "\$1\$2";
print preg_replace($pattern, $replacement, $string);/* Output
====== asc */
?>
$string = " asc ";
$pattern = "|( )(.*?)( )|i";
$replacement = "\$1\$2";
print preg_replace($pattern, $replacement, $string);/* Output
====== asc */
?>
var a=/(&(\w+);(\w+))&\2/gialert(data.replace(a,"$1"))