problem about ereg function

hi, I am using ereg funtion to deal with data submmited by form detail shown below: I am using a form to submit some html code include image path code In submitted php page, I want to replace image path code in html code (submitted by last page' form), unfortunately the image path code include some php variable (eg "imag src ='$phpvaribe'"),I want to use ereg function to replace image path code by the value I need. but when I use eregi_replace fuction try to replace it . but browser show me parsing error . I don't know how to use eregi_replace() when php varible in string which needed to be replaced. Could someone help me. My error code show below: MY ERROR CODE: eregi_replace("^\"(.)*{$img1_name}\"$","$replacestring",$content) remark:the $img1_name is the php variable in the string which needed to be replaced