import re
 
def parse_results(string):
    space = r"\s{0,5}"
    building_type = r"(?:[Uu]nit|[Ss]tudio|[Ff]lat)?"
    street_type = (r"\d+[&-]*\w*\s*"
                   r"(?:[Ee]nd|[Gg]reen|[Cc]auseway|[Cc]heapside|[Cc]rescent|"
                   r"[Ss]treet|[Ll]ane|[Ww]alk|[Rr]oad|[Aa]venue|[Dd]rive|"
                   r"[Pp]ark|[Ww]ay|[Pp]lace|[Pp]arade|[Ii]ndustrial"
                   r"[Ee]state|[Tt]rading [Ee]state|[Hh]ouse|[Gg]reen)")
    postcode = r"[A-Z0-9][A-Z0-9][A-Z0-9]?[A-Z0-9]? {1,2}[0-9][A-Z]{2}"
    pattern = re.compile(rf"{building_type}{space}{street_type}(?:\s{{1,5}}\w+){{0,5}}"
                         rf"{space}{postcode}")
    print(pattern.pattern)
    try:
        return [re.sub(r"\s+", r" ", x) for x in pattern.findall(string)]
    except Exception as e:
        return (f"Error looking for address, exception {e}")
 
print(parse_results('Unit 23 End AS4 0SS'))

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