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");
			}
		}
	}
}