java正则表达式入门问题

Question

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Pattern pat = Pattern.compile("<img (.*)alt*>");
    @SuppressWarnings("resource")
    Scanner scanner = new Scanner(System.in);
    String input = scanner.nextLine();
    Matcher mat = pat.matcher(input);
    boolean resulet= mat.find();
    if (resulet == true){
        System.out.println("yes, i find it");
    }
    else 
        System.out.println("no");

}

我输入的是 没有匹配到这个，麻烦各位了。

Answer 1

[code="java"]
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class App {

//<img src="img.iknow.bdimg.com/jctuijian/0721/jctj.jpg?t=1405910012" alt=""> 
public static void main(String[] args) {
    String imgRegex = "<img[^>]+src\\s*=\\s*['\"]([^'\"]+)['\"][^>]*>";
    //String imgRegex = "<img(\\s+.*?)(?:src\\s*=\\s*(?:'|\")(.*?)(?:'|\"))(.*?)/>"
    Pattern pat = Pattern.compile(imgRegex);
    Scanner scanner = new Scanner(System.in);
    String input = scanner.nextLine();
    Matcher mat = pat.matcher(input);
    boolean resulet = mat.find();
    if (resulet == true) {
        System.out.println("yes, i find it");
    } else
        System.out.println("no");
}

}

[/code]