学习笔记草稿

import java.io.Console; 
import java.util.regex.Pattern; 
import java.util.regex.Matcher; 
 
public class RegexTestHarness { 
 
    public static void main(String[] args) { 
        Console console = System.console(); 
        if (console == null) { 
            System.err.println("No console."); 
            System.exit(1); 
        } 
       
        while (true) { 
            Pattern pattern = Pattern.compile(console.readLine("%nEnter your regex: ")); 
            Matcher matcher = pattern.matcher(console.readLine("Enter input string to search: ")); 
            boolean found = false; 
            while (matcher.find()) { 
                console.format("I found the text \"%s\" starting at index %d " + 
                        "and ending at index %d.%n", 
                        matcher.group(), matcher.start(), matcher.end()); 
                found = true; 
            } 
            if (!found) { 
                console.format("No match found.%n"); 
            } 
        } 
    } 
}