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+package theweeklychallenge;
+
+/*
+
+Week 190:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-190
+
+Task #1: Capital Detection
+
+    You are given a string with alphabetic characters only:
+    A..Z and a..z.
+
+    Write a script to find out if the usage of Capital is appropriate
+    if it satisfies at least one of the following rules:
+
+    1) Only first letter is capital and all others are small.
+    2) Every letter is small.
+    3) Every letter is capital.
+
+Compile and Run:
+
+    mohammad-anwar/java$ javac theweeklychallenge/CapitalDetection.java
+    mohammad-anwar/java$ java  theweeklychallenge.CapitalDetection
+
+*/
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class CapitalDetection extends TestCase {
+
+    static Pattern rule1 = Pattern.compile("^[A-Za-z]+$");
+    static Pattern rule2 = Pattern.compile("^[A-Z][a-z]+$");
+    static Pattern rule3 = Pattern.compile("^[a-z]+$");
+    static Pattern rule4 = Pattern.compile("^[A-Z]+$");
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(
+            theweeklychallenge.CapitalDetection.class
+        );
+    }
+
+    public void testCapitalDetection() {
+        assertTrue(capitalDetection("Perl"));
+        assertTrue(capitalDetection("TPF"));
+        assertFalse(capitalDetection("PyThon"));
+        assertTrue(capitalDetection("raku"));
+    }
+
+    public static boolean capitalDetection(String name) {
+        if (rule1.matcher(name).find()
+            && (rule2.matcher(name).find()
+                || rule3.matcher(name).find()
+                || rule4.matcher(name).find())) {
+            return true;
+        }
+
+        return false;
+    }
+}