var s="<record>"
     +"<name>张三</name>"
     +"<age>23</age>"
     +"<sex>男</sex>"
     +"</record>"
     +"<record>"
     +"<name>李四</name>"
     +"<age>23</age>"
     +"<sex>男</sex>"
     +"</record>"
     +"<record>"
     +"<name>王五</name>"
     +"<age>23</age>"
     +"<sex>男</sex>"
     +"</record>"

/*获取子匹配*/
var oReg1=/<name>(.*?)<\/name>/;
alert(s.match(oReg1)[1]);

/*获取所有匹配*/
var oReg2=/<name>(.*?)<\/name>/g;
var result=s.match(oReg2)
            .join("")
            .replace(/<name>/g,"")
            .replace(/<\/name>/g,"");
alert(result);

public static void main(String[] args) {
  String str = "<record>" + "<name>张三</name>" + "<age>23</age>" + "<sex>男</sex>"
    + "</record>" + "<record>" + "<name>李四</name>" + "<age>23</age>" + "<sex>男</sex>"
    + "</record>" + "<record>" + "<name>王五</name>" + "<age>23</age>" + "<sex>男</sex>"
    + "</record>";
  String[] strArray = getElementsByTag("name", str);
  for (String ss : strArray) {
    System.out.println(ss.replaceAll("<name>", "").replace("</name>", ""));
  }
}
public static String[] getElementsByTag(String tagName, String str) {
  Pattern p = Pattern.compile("<" + tagName + "[^>]*?((>.*?</" + tagName + ">)|(/>))");
  Matcher m = p.matcher(str);
  ArrayList<String> al = new ArrayList<String>();
  while (m.find()) {
    al.add(m.group());
  }
  String[] arr = al.toArray(new String[al.size()]);
  al.clear();
  return arr;
}