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  @Test
  public void testRegex(){
String s = "hel*o";
Pattern pattern = Pattern.compile(s);  // * 创建正则
String source = "helllo helo hello there.";
Matcher m = pattern.matcher(source);   // * 制作Match
int i = 1;
while(m.find()){                       // * 使用 Match  --> 进行正则操作，匹配 find, matches, replaceAll, ....
   System.out.println("m:" + m);
   System.out.println(i + " matched:" + source.substring(m.start(), m.end()));
}

  }