正则表达式

转自：http://hi.baidu.com/nemolfairy/blog/item/989c82155e377c05c93d6d55.html

//匹配单个字符c
Pattern pattern = Pattern.compile("c");
Matcher m = pattern.matcher("abcdef");

//匹配制表符
pattern = Pattern.compile("/t");
m = pattern.matcher("ab cdef");

//匹配回车符
pattern = Pattern.compile("/r");
m = pattern.matcher("ab/rcdef");

//匹配换行符
pattern = Pattern.compile("/n");
m = pattern.matcher("ab/ncdef");

//匹配/
pattern = Pattern.compile("////");
m = pattern.matcher("ab//cdef");

//匹配$
pattern = Pattern.compile("//$");
m = pattern.matcher("ab$$def");

//匹配^
pattern = Pattern.compile("//^");
m = pattern.matcher("ab^def^");

//匹配.
pattern = Pattern.compile("//.");
m = pattern.matcher("a.d.^");

//特别注意//b和//B,//b代表字与字之间的空隙，用来分割字符串的，那么//B就代表字符串之间没有隔断
pattern = Pattern.compile("//D//W//S//b");
m = pattern.matcher("a@45");

pattern = Pattern.compile("//D//W//S//B");
m = pattern.matcher("a@45");

//匹配任意字符，除了换行符
pattern = Pattern.compile(".");
m = pattern.matcher("a3455b/n8");

//匹配0-9之间的任一数字
pattern = Pattern.compile("[0-9]");
m = pattern.matcher("adsfa6gd");

//匹配除0-9之外的任意字符
pattern = Pattern.compile("[^0-9]");
m = pattern.matcher("adsfa6gd");

//匹配大小为3、由数字或字母或下划线组成的字符串
pattern = Pattern.compile("//w{3}");
m = pattern.matcher("adsfa6gd");

//匹配数字或字母或下划线，最少3个，最多6个
pattern = Pattern.compile("//w{3,6}");
m = pattern.matcher("adsfa6gd");

//匹配数字或字母或下划线，最少3个，没有上限
pattern = Pattern.compile("//w{3,}");
m = pattern.matcher("adsfa6gd");

//？表示0个或1个
pattern = Pattern.compile("[^0-9f-kA-F]?");
m = pattern.matcher("adsfa6gd");

//+表示至少一个，相当于{1，}
pattern = Pattern.compile("a+b");
m = pattern.matcher("adsfaab");

//*表示0个或多个，相当于{0，}
pattern = Pattern.compile("a*b");
m = pattern.matcher("adsfaabb");

//^表示开始，$表示结束，即a开始b结束
pattern = Pattern.compile("^a+b$");
m = pattern.matcher("aaaaab");

//用//b表示单词与空格之间的位置，即单词与单词的分界线
pattern = Pattern.compile(".//b.");
m = pattern.matcher("##&and");

//匹配bend,注意"//bend//b"和"bend"的区别
pattern = Pattern.compile("//bend//b");
m = pattern.matcher("weekend,endwith,end");

//|表示或的关系，匹配Tom或Jack
pattern = Pattern.compile("Tom|Jack");
m = pattern.matcher("Tom,Jack");

////s表示空格
pattern = Pattern.compile("(go//s*)+");
m = pattern.matcher("let go go go go!");

pattern = Pattern.compile("&(//d+//.?//d*)");
m = pattern.matcher("&wer.ad,&23.");

//?表示非贪婪模式，尽可能不匹配思想
pattern = Pattern.compile("(d)(//w+?)");
m = pattern.matcher("dxxxdxxxd");

pattern = Pattern.compile("(d)(//w+?)(d)");
m = pattern.matcher("dxxxdxxxd");

//不加？表示贪婪模式，尽可能匹配
pattern = Pattern.compile("(d)(//w+)");
m = pattern.matcher("dxxxdxxxd");

pattern = Pattern.compile("(d)(//w+)(d)");
m = pattern.matcher("dxxxdxxxd");

pattern = Pattern.compile("<td>(.*)</td>");
m = pattern.matcher("<td><p>a</p></td>,<td><p>a</p></td>");

pattern = Pattern.compile("<td>(.*?)</td>");
m = pattern.matcher("<td><p>a</p></td>,<td><p>a</p></td>");

////1表示前面用到的第一个表达式，//n表示前面第n个表达式
pattern = Pattern.compile("('|/")(.*?)//1");
m = pattern.matcher("'hello',/"world/"");

//区别"(//w)//1{4,}"和"(//w){5,}"
pattern = Pattern.compile("(//w)//1{4,}");
m = pattern.matcher("ccccc,ddddddd,wdddd");

pattern = Pattern.compile("(//w){5,}");
m = pattern.matcher("ccccc,ddddddd,wdddd");

pattern = Pattern.compile("<(//w+)//s*(//w+(=('|/").*?//4)?//s*)*>.*?<///1>");
m = pattern.matcher("<td id='td1' style='bgcolor:white'></td> ");

//（？=XXX）只是作为判断条件，只匹配Windows后面紧跟着NT或者XP的那个Windows，本身不占空间
pattern = Pattern.compile("Windows(?=NT|XP)");
m = pattern.matcher("Windows98,WindowsXP,Windows2009");

pattern = Pattern.compile("(//w)((?=//1//1//1)(//1))+");
m = pattern.matcher("aaa 4444 55555 ffffff 7777777 88888888 999999999");

pattern = Pattern.compile("((?!//bstop//b).)+");
m = pattern.matcher("dfad dfasdfasd asdert etret stop ertwer");

//(?!XXX)相当于不等于XXX
pattern = Pattern.compile("do(?!//w)");
m = pattern.matcher("done,do,dog");

//(?<=XXX)是对左边进行判断
pattern = Pattern.compile("(?<=//d{4})//d+(?=//d{4})");
m = pattern.matcher("1234567890123456");

while(m.find()){
System.out.println(m.start());
System.out.println(m.group());
System.out.println(m.end());
}