java正则表达式获取指定HTML标签的指定属性值且替换的方法

public static String repDomain(String source, String domain, String element, String attr) {    String img = "";    Pattern p_image;    Matcher m_image;    String regEx_img = "<" + element + "[^<>]*?//s" + attr + "=['/"]?(.*?)['/"]?(//s.*?)?>";     p_image = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);    m_image = p_image.matcher(source);    while (m_image.find()) {      img = m_image.group();      Matcher m = Pattern.compile("href//s*=//s*/"?(.*?)(/"|>|//s+)").matcher(img);      while (m.find()) {        String srcVal = m.group(1);        if(srcVal.indexOf("/@tenant")>=0){        	int idx = srcVal.indexOf("/@tenant");        	StringBuffer temp = new StringBuffer();        	String dstVal = temp.append(domain).append(srcVal.substring(idx+1)).toString();        	source = source.replace(srcVal, dstVal);        }      }    }    return source;  }