Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; import java.util.regex.PatternSyntaxException; public class Main { public static String stringFilter(String str) throws PatternSyntaxException { String regEx = "[^\\u4E00-\\u9FA5]"; Pattern p = Pattern.compile(regEx); Matcher m = p.matcher(str); return m.replaceAll("").trim(); } }