import java.util.regex.*;

class RegexExample1{

   public static void main(String args[]){

      String content = "I am noob " +

        "from runoob.com.";

      String pattern = ".*runoob.*";

      boolean isMatch = Pattern.matches(pattern, content);

      System.out.println("字符串中是否包含了 'runoob' 子字符串? " + isMatch);

   }

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatches

{

    public static void main( String args[] ){

      // 按指定模式在字符串查找

      String line = "This order was placed for QT3000! OK?";

      String pattern = "(\\D*)(\\d+)(.*)";

      // 创建 Pattern 对象

      Pattern r = Pattern.compile(pattern);

      // 现在创建 matcher 对象

      Matcher m = r.matcher(line);

      if (m.find( )) {

         System.out.println("Found value: " + m.group(0) );

         System.out.println("Found value: " + m.group(1) );

         System.out.println("Found value: " + m.group(2) );

         System.out.println("Found value: " + m.group(3) );

      } else {

         System.out.println("NO MATCH");

      }

   }

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatches

{

    private static final String REGEX = "\\bcat\\b";

    private static final String INPUT =

                                    "cat cat cat cattie cat";

    public static void main( String args[] ){

       Pattern p = Pattern.compile(REGEX);

       Matcher m = p.matcher(INPUT); // 获取 matcher 对象

       int count = 0;

       while(m.find()) {

         count++;

         System.out.println("Match number "+count);

         System.out.println("start(): "+m.start());

         System.out.println("end(): "+m.end());

      }

   }

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatches

{

    private static final String REGEX = "foo";

    private static final String INPUT = "fooooooooooooooooo";

    private static final String INPUT2 = "ooooofoooooooooooo";

    private static Pattern pattern;

    private static Matcher matcher;

    private static Matcher matcher2;

    public static void main( String args[] ){

       pattern = Pattern.compile(REGEX);

       matcher = pattern.matcher(INPUT);

       matcher2 = pattern.matcher(INPUT2);

       System.out.println("Current REGEX is: "+REGEX);

       System.out.println("Current INPUT is: "+INPUT);

       System.out.println("Current INPUT2 is: "+INPUT2);

       System.out.println("lookingAt(): "+matcher.lookingAt());

       System.out.println("matches(): "+matcher.matches());

       System.out.println("lookingAt(): "+matcher2.lookingAt());

   }

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatches

{

    private static String REGEX = "dog";

    private static String INPUT = "The dog says meow. " +

                                    "All dogs say meow.";

    private static String REPLACE = "cat";

    public static void main(String[] args) {

       Pattern p = Pattern.compile(REGEX);

       // get a matcher object

       Matcher m = p.matcher(INPUT);

       INPUT = m.replaceAll(REPLACE);

       System.out.println(INPUT);

   }

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class RegexMatches

{

   private static String REGEX = "a*b";

   private static String INPUT = "aabfooaabfooabfoobkkk";

   private static String REPLACE = "-";

   public static void main(String[] args) {

      Pattern p = Pattern.compile(REGEX);

      // 获取 matcher 对象

      Matcher m = p.matcher(INPUT);

      StringBuffer sb = new StringBuffer();

      while(m.find()){

         m.appendReplacement(sb,REPLACE);

      }

      m.appendTail(sb);

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

   }

}