Java正則表達式使用實例

先看一個簡單的例子

 

java 代碼

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

public class GetParen0 {
  public static void main(String[] args) {
    Pattern myRE = Pattern.compile("d.*ian");  //(.*?)
    Matcher matcher = myRE
        .matcher("darwinian pterodactyls soared over the devonian space");
    matcher.lookingAt();
    String result = matcher.group(0);
    System.out.println(result);
  }
}

 

程序的輸出結果： darwinian pterodactyls soared over the devonian

如果將pattern改爲  "d(.*?)ian"  ，那麼輸出結果爲：darwinian

再看一個例子

java 代碼

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

public class GetParen1 {
  public static void main(String[] args) {
    Pattern patt = Pattern.compile("(\\w+)\\s(\\d+)");
    Matcher matcher = patt.matcher("Bananas 123");
    matcher.lookingAt();
    System.out.println("Name: " + matcher.group(1));
    System.out.println("Number: " + matcher.group(2));
  }
}

這個例子輸出結果爲：  Name: Bananas              Number: 123

其中group(1)是指(\\w+)的匹配內容，group(2)是指(\\d+)的匹配內容