diff --git a/Problem Solving/replace whitespaces with underscores.py b/Problem Solving/replace whitespaces with underscores.py
new file mode 100644
index 0000000..e37da41
--- /dev/null
+++ b/Problem Solving/replace whitespaces with underscores.py	
@@ -0,0 +1,16 @@
+import re
+
+
+Input = input("Please enter a string: ")
+def replace_white_spaces_with_underscores(input_string):
+    list_input = list(input_string)
+    final_string = " "
+    white_spaces = []
+    for match in re.finditer('\s', input_string):
+        white_spaces.append(match.start())
+
+    for i in range(len(white_spaces)):
+        list_input[white_spaces[i]] = "_"
+    return final_string.join(list_input)
+
+print(replace_white_spaces_with_underscores(Input))