phani123java
diff --git a/‎Chapter13/RegexBoundaryMatch.png‎
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diff --git a/‎Chapter13/RegexDemo.png‎
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diff --git a/‎Chapter13/RegexTestHarness.java‎
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+import java.io.Console;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+// This demo comes from <a href="https://docs.oracle.com/javase/tutorial/essential/regex/test_harness.html">Java Tutorial</a>
+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");
+			}
+		}
+	}
+}