start_case()

Convert a string into Start Case: - Splits on spaces, punctuation, and camelCase - Capitalizes each word (preserves ALLCAPS words) - Drops apostrophes

Implementation

Args: string: The input string Returns: The Start Cased string

Example

start_case("helloWorld_test")

Expected output: "Hello World Test"

Source Code

                        def start_case(string: str) -> str:
    if string is None:
        return ""
    s = str(string).strip()
    if not s:
        return ""
    # camelCase splits
    s = re.sub(r"([A-Z]+)([A-Z][a-z])", r"\1 \2", s)
    s = re.sub(r"([a-z0-9])([A-Z])", r"\1 \2", s)
    # drop apostrophes
    s = s.replace("'", "")
    # non-alphanumerics → spaces
    s = re.sub(r"[^A-Za-z0-9]+", " ", s)
    words = [w for w in s.split(" ") if w]
    def _cap(w):
        return w.upper() if w.isupper() else w.lower().capitalize()
    return " ".join(_cap(w) for w in words)
                    