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gatekeeping (mander.xyz)
submitted 10 months ago by fossilesque@mander.xyz to c/science_memes@mander.xyz
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[-] morrowind@lemmy.ml 20 points 10 months ago* (last edited 10 months ago)

[0-9]*\.?[0-9]*

edit: ok no empty strings [0-9]+\.?[0-9]*

[-] amoistgrandpa@lemm.ee 8 points 10 months ago

That regex implies “” is a number

[-] dalekcaan@lemm.ee 21 points 10 months ago

If I had a nickel for every time that happened I'd have "" nickels.

[-] dsemy@lemm.ee 5 points 10 months ago

I didn't realize '.' is a number.

\([0-9]+\.[0-9]\)?[0-9]* is more accurate I think.

[-] morrowind@lemmy.ml 1 points 10 months ago

I don't quite understand yours, why does it need parentheses? And requires the decimal point?

how about [0-9]+\.?[0-9]*

[-] dsemy@lemm.ee 4 points 10 months ago* (last edited 10 months ago)

The parens in my regex group part of the regex, so the following '?' makes the entire group optional.

Your regex matches (for example) '5.' as a number.

Mine is also slightly wrong, it matches a blank string as a number. Here's a better one:

[0-9]+\(\.[0-9]+\)?

[-] morrowind@lemmy.ml 1 points 10 months ago

Your regex matches (for example) '5.' as a number

Yeah that's on purpose. That's often used in sciences to mark significant digits.

The thing I'm confused by in yours is you're escaping the parenthesis, so there need to be literal parenthesis in the matching number, or that's what it showed in the regex checker.

[-] Stupidmanager@lemmy.world 3 points 10 months ago

well sure, if you want to be fancy. i was speaking in layman terms for the rest of the world.

regex for the win.

[-] Mithre@lemmy.world 1 points 10 months ago

What about imaginary numbers?

[-] morrowind@lemmy.ml 2 points 10 months ago

[0-9]+\.?[0-9]*[ij]?

I'm not making one for mixed numbers

this post was submitted on 11 Dec 2023
929 points (97.8% liked)

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