java regexp

 public class Test2 {
public static void main(String[] args) {
// 简单认识正则表达式的概念
/*
* p("abc".matches("...")); p("a8729a".replaceAll("\\d", "-")); Pattern
* p = Pattern.compile("[a-z]{3}"); Matcher m = p.matcher("fgh");
* p(m.matches()); p("fgha".matches("[a-z]{3}"));
*/
// 初步认识. * + ?
/*
* p("a".matches(".")); p("aa".matches("aa")); p("aaaa".matches("a*"));
* p("aaaa".matches("a+")); p("".matches("a*"));
* p("aaaa".matches("a?")); p("".matches("a?")); p("a".matches("a?"));
* p("214523145234532".matches("\\d{3,100}"));
* p("192.168.0.aaa".matches(
* "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"));
* p("192".matches("[0-2][0-9][0-9]"));
*/
// 范围
/*
* p("a".matches("[abc]")); p("a".matches("[^abc]"));
* p("A".matches("[a-zA-Z]")); p("A".matches("[a-z]|[A-Z]"));
* p("A".matches("[a-z[A-Z]]")); p("R".matches("[A-Z&&[RFG]]"));
*/
// 认识\s \w \d \
/*
* p(" \n\r\t".matches("\\s{4}")); p(" ".matches("\\S"));
* p("a_8".matches("\\w{3}"));
* p("abc888&^%".matches("[a-z]{1,3}\\d+[&^#%]+"));
* p("\\".matches("\\\\"));
*/
// POSIX Style
// p("a".matches("\\p{Lower}"));
// boundary
/*
* p("hello sir".matches("^h.*")); p("hello sir".matches(".*ir$"));
* p("hello sir".matches("^h[a-z]{1,3}o\\b.*"));
* p("hellosi