regextestharnessv4.java

Regular Expressions of Java Tutorial

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexTestHarnessV4 {

	public static void main(String[] args) throws IOException {
		BufferedReader br  = new BufferedReader(
				new InputStreamReader(new BufferedInputStream(System.in))
			);
		while (true) {
			System.out.print("\nEnter your regex: ");
			Pattern pattern = Pattern.compile(br.readLine());
			System.out.print("Enter input string to search: ");
			Matcher matcher = pattern.matcher(br.readLine());
			boolean found = false;
			while (matcher.find()) {
				System.out.println("I found the text \"" + matcher.group() + 
						"\" starting at index " + matcher.start() + 
						" and ending at index " + matcher.end() + 
						".");
				found = true;
			}
			if (!found) {
				System.out.println("No match found.");
			}
		}
	}
}