content text... text... text... content text... text... text...'; $pattern = 'var'; $replacement = 'VAR'; $pattern = '/<\?if\(\$var \)\?>([^>]*)/i'; $replacement = ''; #echo preg_replace($pattern, $replacement, $string); /*$user = preg_replace("<\?if\(\$(.*?)\)\?>(.*?)/i","<\?php if\($(.*?)\) { echo \'\2\';?>",$user); echo $user */ $user="User1"; $user = preg_replace("(.*)","{1}aaa",$user); echo $user; ?>