Sometimes when I do complicated regular expressions, I like to divide the
patterns from a big pattern to small patterns until I reach what I want. re
module functions take the text as a second argument. Furthermore, you can’t
pass the Match object directly, you need to extract the group/text from it. If
we have a placeholder for the passed argument, we could do both 1) put it
wherever we want, not necessarily first 2) further manipulate it so it becomes
a valid argument
number = text -> re.search(pattern1, _)
-> re.search(pattern2, _.group(0))
-> re.search(pattern3, _.group(1))
-> float(_.group(0))
Yeah that can look ugly I agree (here intentionally the placeholder is
overused). But the person can still write a flowing chained operation if they
want or if it’s easier for them to understand. Or just do it the traditional
way …
text1 = re.search(pattern1, text).group(0)
text2 = re.search(pattern2, text1).group(1)
text3 = re.search(pattern3, text2).group(0)
number = float(text3)
> It's always possible to make a proposal more general by making it less
> clean. Is the loss of generality from "must pipe into the first
> argument" (or "must pipe into last argument", pick whichever one you
> want to go with) actually as restrictive as you think? People don't
> tend to write add() and pow() like this, because we have operators.
> With real-world code, how commonly is this actually going to be a
> problem?
>
> ChrisA
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