Java 正则表达式 Java 正则表达式仔细讲解

//查找以Java开头,任意结尾的字符串
 Pattern pattern = Pattern.compile("^Java.*");
 Matcher matcher = pattern.matcher("Java不是人");
 boolean b= matcher.matches();
 //当条件满足时，将返回true，否则返回false
 System.out.println(b);

Pattern pattern = Pattern.compile("[, |]+");
String[] strs = pattern.split("Java Hello World Java,Hello,,World|Sun");
for (int i=0;i<strs.length;i++) {
 System.out.println(strs[i]);
} 

Pattern pattern = Pattern.compile("正则表达式");
Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World");
//替换第一个符合正则的数据
System.out.println(matcher.replaceFirst("Java"));

Pattern pattern = Pattern.compile("正则表达式");
Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World");
//替换第一个符合正则的数据
System.out.println(matcher.replaceAll("Java"));

Pattern pattern = Pattern.compile("正则表达式");
Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World ");
StringBuffer sbr = new StringBuffer();
while (matcher.find()) {
 matcher.appendReplacement(sbr, "Java");
}
matcher.appendTail(sbr);
System.out.println(sbr.toString());

String str="ceponline@yahoo.com.cn";
Pattern pattern = Pattern.compile("[//w//.//-]+@([//w//-]+//.)+[//w//-]+",Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(str);
System.out.println(matcher.matches());

Pattern pattern = Pattern.compile("<.+?>", Pattern.DOTALL);
Matcher matcher = pattern.matcher("<a href=/"index.html/">主页</a>");
String string = matcher.replaceAll("");
System.out.println(string);

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());
}

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;
}

 //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|.]*");
  }