import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegTest {
public static void main(String[] args) {
String tar = "asdflknaslknsadfisadnfsdfnsdfns<img src=\"a.jpg\">sdfasd" +
    "fsadfsnn<img src=\"b.gif\">adsfsadf" +
    "sflsadkfnsdalkfnsdalknf<img src=\"c.bmp\">safnsadflnke";
List<String> imgList = getImg(tar);
for (String string : imgList) {
   int begin = string.indexOf("\"")+1;
   int end = string.lastIndexOf("\"");
   System.out.println(string.substring(begin,end));
}

}
/** 
   *   
   * @param s 
   * @return »ñµÃͼƬ
   */ 
public static List<String> getImg(String s)   
{   
   String regex;   
   List<String> list = new ArrayList<String>();   
   regex = "src=\"(.*?)\"";   
   Pattern pa = Pattern.compile(regex, Pattern.DOTALL);   
   Matcher ma = pa.matcher(s);   
   while (ma.find())   
   {
    list.add(ma.group());   
   }   
   return list;   
}   
}