1、public boolean matches(String regex)
(正则验证,判断是否匹配给定的正则表达式)
2、public String replaceAll(String regex,String replacement)
(全部替换)
3、public String replaceFirst(String regex,String replacement)
(首个替换)
4、public String[] split(String regex)
(全部拆分)
5、public String[] split(String regex,int limit)
(部分拆分)