[Expo-tech] cracked regex

[Wookey]

On 2020-05-13 19:38 +0100, Philip Sargent (Gmail) wrote:
> Hah. In your face regex:
> regex_starref =
> re.compile(r'^\s*\*ref[\s.:]*((?:19[6789]\d)|(?:20[0123]\d))\s*#?\s*(X)?\s*(
> .*?\d+.*?)$(?i)')

Putting in a ?x and some comments would be helpful (assuming that re.compile supports that)
'?x
^\s*\*ref       # look for *ref at start of line
[\s.:]*         # some spaces or colons
((?:19[6789]\d)|(?:20[0123]\d)) # a date from 1960 to 2039
\s*#            # hash separator (need to escape the actual hash I guess?)
?\s*(X)         # optional X
?\s*(.*?\d+.*?) # maybe a space, then at least one digit in the string 
$(?i)'          # the end  (do the whole thing case insensitively)

So much easier if you ever have to edit the damn thing.
(.*?\d+.*?) seems like it might be a bit lax? Comments afterwards is fair
enough, but 'as much text as you like' between the # and wallet ID?

> I have beaten the monster.

Satisfying when it works, isn't it?

Wookey
-- 
Principal hats:  Linaro, Debian, Wookware, ARM
http://wookware.org/
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