请教一个 Regex 的写法

[lrmymycn]

1. <a href="something.html">something</a>
2. <a href="http://www.domain.com/something.html">something</a>

一段代码里有这2种链接，现在我要把第一种找出来，然后加上http变成第2种，请问怎么写？

谢谢

[qinqinxiatiao]

String regex="<a href=";

String str="<a href=\"something.html\">something </a> "

String finalStr = str.replaceAll(regex,"<a href=\"http://www.domain.com/")

sysout(finalStr)

[水中影子]

不好找哦，帮你顶下，
给你个思路，在路径后加个参数分辨一下就容易多了

[haojia0716]

直接这样就可以了吧

		String s1 = "<a href=\"something.html\">something </a>";
		String s2 = s1.replaceAll("href=\"", "href=\"http://www.domain.com/");
		System.out.println(s2);

[qinqinxiatiao]

获取<a href....></a>的正则表达式
regex = "<a[^>]*href=(\"([^\"]*)\"|\'([^\']*)\'|([^\\s>]*))[^>]*>(.*?)</a>";

可以先获取所有连接，再用replaceAll替换成你的需要的。 或者先替换在用正则表达式取链接。

[yanliang_xt]

import java.util.regex.*;
//<a href="something.html">something </a> 
//<a href="http://www.domain.com/something.html">something </a> 

public class Test66
{
	public static void main(String... args) {
		StringBuilder sb = new StringBuilder();
		sb.append("<a href=\"http://www.domain.com/");
		String str = "<a href=\"something.html\">something </a>";
		Matcher m = Pattern.compile("<a href=\"(.*?)\">(.*?)</a>").matcher(str);
		while(m.find()) {
			sb.append(m.group(1));
			sb.append(">");
			sb.append(m.group(2));
			sb.append("</a>");
		}
		System.out.println(sb.toString());
	}
}

[bigbug9002]

public class Test{
    public static void main(String args[])  throws Exception{
    	
        String regex="(<a[^>]*href=\")(?!\\w+://)(www)*";
        String str="<a href=\"something.html\">something</a> \n"
                  +"<a href=\"http://www.domain.com/something.html\">something </a>\n" 
                  +"<a href=\"ftp://www.domain.com/something.html\">something </a>\n"
                  +"<a href=\"www.something.html\">something</a>";
        String result = str.replaceAll(regex,"$1http://www");
        System.out.println(result); 
    }
}

结果:
F:\java>java Test
<a href="http://wwwsomething.html">something</a>
<a href="http://www.domain.com/something.html">something </a>
<a href="ftp://www.domain.com/something.html">something </a>
<a href="http://www.something.html">something</a>

[bigbug9002]

不太对,改为:

public static void main(String args[])  throws Exception{
    	//String str="12×(-3+12)-9/-2";
        //System.out.println(Arrays.toString(str.split("(?=[+×/()-])|((?<=[+×/()-])(?<![+×/(-]{2}))")));
        String regex="(<a[^>]*href=\")(?!\\w+://)(www\\.)*";
        String str="<a href=\"something.html\">something</a> \n"
                  +"<a href=\"http://www.domain.com/something.html\">something </a>\n" 
                  +"<a href=\"ftp://www.domain.com/something.html\">something </a>\n"
                  +"<a href=\"www.something.html\">something</a>";
        String result = str.replaceAll(regex,"$1http://www.");
        System.out.println(result); 
    }

[bigbug9002]

F:\java>java Test
<a href="http://www.something.html">something</a>
<a href="http://www.domain.com/something.html">something </a>
<a href="ftp://www.domain.com/something.html">something </a>
<a href="http://www.something.html">something</a>

[lrmymycn]

public class StringReplace {
public static void main(String[] args) {
String EMPTY_HREF = "href=\"([^(http)].*)\"";
String FLL_HREF = "href=\"http://www.domain.com/$1\"";

String text = "<a href=\"something.html\">something</a><a href=\"https://www.domain.com/something.html\">something</a>";
text = text.replaceAll(EMPTY_HREF, FLL_HREF);
System.out.println(text);
}
}

自己写出来了，不过还是感谢大家