Java正则表达式入门(3)

◆验证是否为邮箱地址

String str="[e-mail]";

Pattern pattern = Pattern.compile("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+",Pattern.CASE_INSENSITIVE);

Matcher matcher = pattern.matcher(str);

System.out.println(matcher.matches());

◆去除html标记

attern pattern = Pattern.compile("＜.+?＞", Pattern.DOTALL);

Matcher matcher = pattern.matcher("＜a href=\"index.html\"＞主页＜/a＞");

String string = matcher.replaceAll("");

System.out.println(string);

◆查找html中对应条件字符串

Pattern pattern = Pattern.compile("href=\"(.+?)\"");

Matcher matcher = pattern.matcher("＜a href=\"index.html\"＞主页＜/a＞");

if(matcher.find())

System.out.println(matcher.group(1));

}

◆截取http://地址

//截取url

Pattern pattern = Pattern.compile("(http://|https://){1}[\\w\\.\\-/:]+");

Matcher matcher = pattern.matcher("dsdsds＜http://dsds//gfgffdfd＞fdf");

StringBuffer buffer = new StringBuffer();

while(matcher.find()){    

          buffer.append(matcher.group());  

      buffer.append("\r\n");        

      System.out.println(buffer.toString());

}

◆替换指定{}中文字

String str = "Java目前的发展史是由{0}年-{1}年";

String[][] object={new String[]{"\\{0\\}","1995"},new String[]{"\\{1\\}","2007"}};

System.out.println(replace(str,object));

public static String replace(final String sourceString,Object[] object) {

String temp=sourceString; 

   for(int i=0;i＜object.length;i++){

String[] result=(String[])object[i];

Pattern    pattern = Pattern.compile(result[0]);

Matcher matcher = pattern.matcher(temp);

temp=matcher.replaceAll(result[1]);

}

return temp;

}

◆以正则条件查询指定目录下文件

 //用于缓存文件列表        private ArrayList files = new ArrayList();        //用于承载文件路径        private String _path;        //用于承载未合并的正则公式        private String _regexp;                class MyFileFilter implements FileFilter {              /**               * 匹配文件名称               */              public boolean accept(File file) {                try {                  Pattern pattern = Pattern.compile(_regexp);                  Matcher match = pattern.matcher(file.getName());                                  return match.matches();                } catch (Exception e) {                  return true;                }              }            }                /**         * 解析输入流         * @param inputs         */        FilesAnalyze (String path,String regexp){            getFileName(path,regexp);        }                /**         * 分析文件名并加入files         * @param input         */        private void getFileName(String path,String regexp) {            //目录              _path=path;              _regexp=regexp;              File directory = new File(_path);              File[] filesFile = directory.listFiles(new MyFileFilter());              if (filesFile == null) return;              for (int j = 0; j < filesFile.length; j++) {                files.add(filesFile[j]);              }              return;            }            /**         * 显示输出信息         * @param out         */        public void print (PrintStream out) {            Iterator elements = files.iterator();            while (elements.hasNext()) {                File file=(File) elements.next();                    out.println(file.getPath());                }        }        public static void output(String path,String regexp) {            FilesAnalyze fileGroup1 = new FilesAnalyze(path,regexp);            fileGroup1.print(System.out);        }            public static void main (String[] args) {            output("C:\\","[A-z|.]*");        }

Java正则的功用还有很多，事实上只要是字符处理，就没有正则做不到的事情存在