Java

public class RegexTestHarness {

	public static void main(String[] args) {
		while (true) {
			try {
				BufferedReader console = new BufferedReader(new InputStreamReader(System.in)); // only this can provide a buffered reading
				System.out.println("Enter your regex:");
				String strValue = console.readLine(); // read value
				Pattern pattern = Pattern.compile(strValue); // create pattern
			
				System.out.println("Enter input string to search:");
				String strMatch = console.readLine();
				Matcher matcher = pattern.matcher(strMatch);
	
				boolean found = false;
				while (matcher.find()) {
					System.out.println(String.format("I found the text" + " \"%s\" starting at "
							+ "index %d and ending at index %d.",
							matcher.group(), matcher.start(), matcher.end()));
					found = true;
				}
				if (!found) {
					System.console().format("No match found.");
				}
			} catch (IOException oException) { oException.printStackTrace();} // for the buffered reader - in case it fails
		}
	}
}

if (!found) {
	System.out.println("No match found.");
}