diff --git a/core-java-modules/core-java-regex-2/src/main/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnInteger.java b/core-java-modules/core-java-regex-2/src/main/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnInteger.java
deleted file mode 100644
index a8fde1dc16..0000000000
--- a/core-java-modules/core-java-regex-2/src/main/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnInteger.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.baeldung.firstoccurrenceofaninteger;
-
-public class FirstOccurrenceOfAnInteger {
-
-	public static Integer findFirstInteger(String s) {
-		int i = 0;
-		while (i < s.length() && !Character.isDigit(s.charAt(i))) {
-			i++;
-		}
-		int j = i;
-		while (j < s.length() && Character.isDigit(s.charAt(j))) {
-			j++;
-		}
-		return Integer.parseInt(s.substring(i, j));
-	}
-}
diff --git a/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnIntegerTests.java b/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnIntegerTests.java
deleted file mode 100644
index 54779bab9a..0000000000
--- a/core-java-modules/core-java-regex-2/src/test/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnIntegerTests.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.baeldung.firstoccurrenceofaninteger;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Scanner;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.Assertions;
-
-
-class FirstOccurrenceOfAnIntegerTests {
-
-	@Test
-	public void whenUsingPatternMatcher_findFirstInteger() {
-		String s = "ba31dung123";
-		Matcher matcher = Pattern.compile("\\d+").matcher(s);
-		matcher.find();
-		int i = Integer.parseInt(matcher.group());
-		Assertions.assertEquals(31, i);
-	}
-
-	@Test
-	public void whenUsingScanner_findFirstInteger() {
-		int i = new Scanner("ba31dung123").useDelimiter("\\D+").nextInt();
-		Assertions.assertEquals(31, i);
-	}
-
-	@Test
-	public void whenUsingSplit_findFirstInteger() {
-		String str = "ba31dung123";
-		List<String> tokens = Arrays.stream(str.split("\\D+"))
-				.filter(s -> s.length() > 0).collect(Collectors.toList());
-		Assertions.assertEquals(31, Integer.parseInt(tokens.get(0)));
-	}
-
-	@Test
-	public void whenUsingCustomFunction_findFirstInteger() {
-		String str = "ba31dung123";
-		Integer i = FirstOccurrenceOfAnInteger.findFirstInteger(str);
-		Assertions.assertEquals(31, i);
-	}
-
-
-}