Java正則邊界匹配器[\A]匹配

邊界匹配器[\A]匹配輸入的開頭。

範例

以下範例顯示了邊界匹配器的用法。

package com.yiibai;

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

public class BoundaryMatcherDemo {
   private static final String REGEX = "\\A";
   private static final String INPUT = "Welcome to Tw511.COM";

   public static void main(String[] args) {
      // create a pattern
      Pattern  pattern = Pattern.compile(REGEX);

      // get a matcher object
      Matcher matcher = pattern.matcher(INPUT); 

      while(matcher.find()) {
         //Prints the start index of the match.
         System.out.println("Match String start(): "+matcher.start());
      }
   }
}

編譯並執行上面的程式，這將產生以下結果 -

Match String start(): 0