Java regular expression gets the URL address in the src of the <img src> in the HTML string

/*** Get the address of the picture on the webpage*/     Public StaticSet<string>getimgstr (String htmlstr) {Set<String> pics =NewHashset<>(); String img= "";        Pattern P_image;        Matcher M_image; //String regex_img = "]*?> "; //Image Link AddressString regex_img = "]*?> "; P_image=pattern.compile (regex_img, pattern.case_insensitive); M_image=P_image.matcher (HTMLSTR);  while(M_image.find ()) {//get  DataIMG =M_image.group (); //match src data in Matcher m = pattern.compile ("src\\s*=\\s*\"? *?) (\ "|>|\\s+)"). Matcher (IMG);  while(M.find ()) {Pics.add (M.group (1)); }        }        returnpics; }

Java regular expression gets the URL address in the src of the in the HTML string