Java正则表达式，匹配除 [英] Java Regular Expression, match everything but

问题描述

我想匹配除 *.xhtml 之外的所有内容.我有一个 servlet 正在侦听 *.xhtml 并且我想要另一个 servlet 来捕获其他所有内容.如果我将 Faces Servlet 映射到所有内容 (*)，它会在处理图标、样式表和所有不是人脸请求的内容时爆炸.

I would like to match everything but *.xhtml. I have a servlet listening to *.xhtml and I want another servlet to catch everything else. If I map the Faces Servlet to everything (*), it bombs out when handling icons, stylesheets, and everything that is not a faces request.

这是我一直尝试失败的方法.

This is what I've been trying unsuccessfully.

Pattern inverseFacesUrlPattern = Pattern.compile(".*(^(\\.xhtml))");

有什么想法吗?

谢谢，

沃尔特

推荐答案

你需要的是一个 否定后视(java 示例).

What you need is a negative lookbehind (java example).

String regex = ".*(?<!\\.xhtml)$";
Pattern pattern = Pattern.compile(regex);

此模式匹配不以.xhtml"结尾的任何内容.

This pattern matches anything that doesn't end with ".xhtml".

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class NegativeLookbehindExample {
  public static void main(String args[]) throws Exception {
    String regex = ".*(?<!\\.xhtml)$";
    Pattern pattern = Pattern.compile(regex);

    String[] examples = { 
      "example.dot",
      "example.xhtml",
      "example.xhtml.thingy"
    };

    for (String ex : examples) {
      Matcher matcher = pattern.matcher(ex);
      System.out.println("\""+ ex + "\" is " + (matcher.find() ? "" : "NOT ") + "a match.");
    }
  }
}

所以:

% javac NegativeLookbehindExample.java && java NegativeLookbehindExample                                                                                                                                        
"example.dot" is a match.
"example.xhtml" is NOT a match.
"example.xhtml.thingy" is a match.

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