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devel / comp.lang.python / Re: Code improvement question

SubjectAuthor
o Code improvement questionMRAB

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Re: Code improvement question

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Subject: Re: Code improvement question
Date: Tue, 14 Nov 2023 23:25:10 +0000
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 by: MRAB - Tue, 14 Nov 2023 23:25 UTC

On 2023-11-14 23:14, Mike Dewhirst via Python-list wrote:
> I'd like to improve the code below, which works. It feels clunky to me.
>
> I need to clean up user-uploaded files the size of which I don't know in
> advance.
>
> After cleaning they might be as big as 1Mb but that would be super rare.
> Perhaps only for testing.
>
> I'm extracting CAS numbers and here is the pattern xx-xx-x up to
> xxxxxxx-xx-x eg., 1012300-77-4
>
> def remove_alpha(txt):
>
>     """  r'[^0-9\- ]':
>
>     [^...]: Match any character that is not in the specified set.
>
>     0-9: Match any digit.
>
>     \: Escape character.
>
>     -: Match a hyphen.
>
>     Space: Match a space.
>
>     """
>
>     cleaned_txt = re.sub(r'[^0-9\- ]', '', txt)
>
>     bits = cleaned_txt.split()
>
>     pieces = []
>
>     for bit in bits:
>
>         # minimum size of a CAS number is 7 so drop smaller clumps of digits
>
>         pieces.append(bit if len(bit) > 6 else "")
>
>     return " ".join(pieces)
>
>
> Many thanks for any hints
>
Why don't you use re.findall?

re.findall(r'\b[0-9]{2,7}-[0-9]{2}-[0-9]{2}\b', txt)

devel / comp.lang.python / Re: Code improvement question

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