[RegEx] finding a word BEFORE a (

[NoteMe]

How do I do that...like if I have this:

#Hello mother
def main():
    if len(sys.argv) < 1:
        usage() #Yeah thats your mother all right
    else:
        kek_number_list = tidy_up_file(sys.argv[1])
        
        if kek_number_list != -1:
            download_pdf(kek_number_list)

It should match "main", "len", "usage", "tidy_up_file", and "download_pdf", but NOT the ( after it.


I tried this:
\s[\d\w^\S]*\(

and it matches the word in front AND the ( but I don't want the(...