Fixes #9726 Convert Camel case t0 Snake Case

strings/camel_case_to_snake_case.py

@@ -0,0 +1,42 @@
+def camel_to_snake(camel_str : str) -> str :
+    import re
+
+    """
+    >>> camel_to_snake('someRandomStringWithNumbers123')
+    'some_random_string_with_numbers_1_2_3'
+    >>> camel_to_snake('someRandomString')
+    'some_random_string'
+    >>> camel_to_snake(123)                
+    Traceback (most recent call last):
+        ...
+    ValueError: Expected string as input, found <class 'int'>
+
+    """
+
+
+    # Raises an error if the input is not a string
+    if not isinstance(camel_str, str):
+        msg = f"Expected string as input, found {type(camel_str)}"
+        raise ValueError(msg)
+
+    """ Use regular expressions to find all occurrences of capital letters
+        followed by lowercase letters or digits. """
+    pattern = re.compile(r'(?<=[a-z0-9])([A-Z0-9])')
+
+    # Replace the capital letter or digit with an underscore and the lowercase version.
+    snake_str = re.sub(pattern, r'_\1', camel_str)
+
+    # Convert the result to lowercase to get snake_case
+    snake_str = snake_str.lower()
+
+    # If the string starts with a capital letter, add an underscore at the beginning.
+    if camel_str[0].isupper():
+        snake_str = '_' + snake_str
+
+    return snake_str
+
+
+if __name__ == "__main__" : 
+    import doctest
+
+    doctest.testmod()