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±à³ÌÌ⣺½«Ò»¸öÍøÖ·µÄÖм䲿·Ö½ØÈ¡³öÀ´£¬µÃµ½alipay.com
Java code:
String url = "http://topic.csdn.net/u/20091019/10/f8173f20-5eda-438b-a8ae-17e3ff9ec94e.html?40383";
String pattern = "(http://)?([^/]*)(/?.*)";

System.out.println(url.replaceAll(pattern, "$2"));


¿´²»¶®×îºóÄǸö$2ÊÇʲôÒâ˼£¬¹À¼Æ»¹ÓÐ$1,$3°É£¬´ú±íÌØ¶¨Òâ˼£¿ÓÐÈËÄܽâÎöÏÂÂð

private static void p(String s) {
    Pattern p=Pattern.compile("alipay[.]com");
    Matcher m=p.matcher(s);
while(m.find()){
System.out.println(m.group());
System.out.println(m.start());
}

ÒýÓÃ
¿´²»¶®×îºóÄǸö$2ÊÇʲôÒâ˼£¬¹À¼Æ»¹ÓÐ$1,$3°É£¬´ú±íÌØ¶¨Òâ˼£¿ÓÐÈËÄܽâÎöÏÂÂð


$2 ´ú±íµÚ¶þ¸ö×ÓÆ¥Åä([^/]*)£¬ÏàÓ¦µÄ$3´ú±íµÚÈý¸ö£¬×ÓÆ¥ÅäÊÇÒÔ×óÀ¨ºÅ¡°£¨¡±¿ªÊ¼´Ó×óÏòÓÒÆ¥ÅäµÄ¡£

understand?

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ÒýÓÃ
private static void p(String s) {
    Pattern p=Pattern.compile("alipay[.]com");
    Matcher m=p.matcher(s);
while(m.find()){
System.out.println(m.group());
System.out.println(m.start());
}


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