[BAEL-6485_RM-Punctuation] Remove Punctuation (#13946)

core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/delpunctuation/RemovePunctuationUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.delpunctuation;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class RemovePunctuationUnitTest {
+    private static final String INPUT = "Its 1 W o r d (!@#$%^&*{}[];':\")<>,.";
+    private static final String EXPECTED = "Its 1 W o r d ";
+
+    private static final String UNICODE_INPUT = "3 March März 三月 březen маршировать (!@#$%^&*{}[];':\")<>,.";
+    private static final String UNICODE_EXPECTED = "3 March März 三月 březen маршировать ";
+
+    @Test
+    void whenUsingCharClassRange_thenGetExceptedResult() {
+        String result = INPUT.replaceAll("[^\\sa-zA-Z0-9]", "");
+        assertEquals(EXPECTED, result);
+    }
+
+    @Test
+    void whenUsingPunctuationCharClass_thenGetExceptedResult() {
+        String result = INPUT.replaceAll("\\p{Punct}", "");
+        assertEquals(EXPECTED, result);
+    }
+
+    @Test
+    void whenInputContainsUnicodeChars_thenGetExceptedResult() {
+        String result1 = UNICODE_INPUT.replaceAll("[^\\sa-zA-Z0-9]", "");
+        assertNotEquals(UNICODE_EXPECTED, result1);
+
+        String actualResult1 = "3 March Mrz  bezen  ";
+        assertEquals(actualResult1, result1);
+
+
+        String result2 = UNICODE_INPUT.replaceAll("\\p{Punct}", "");
+        assertEquals(UNICODE_EXPECTED, result2);
+
+        String result3 = UNICODE_INPUT.replaceAll("[^\\s\\p{L}0-9]", "");
+        assertEquals(UNICODE_EXPECTED, result3);
+    }
+
+}