this post was submitted on 11 Dec 2023
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Science Memes

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submitted 11 months ago by [email protected] to c/[email protected]
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[–] [email protected] 20 points 11 months ago* (last edited 11 months ago) (5 children)

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

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

[–] [email protected] 8 points 11 months ago (1 children)

That regex implies “” is a number

[–] [email protected] 21 points 11 months ago

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

[–] [email protected] 5 points 11 months ago (1 children)

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

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

[–] [email protected] 1 points 11 months ago (1 children)

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

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

[–] [email protected] 4 points 11 months ago* (last edited 11 months ago) (1 children)

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

[–] [email protected] 1 points 11 months ago (1 children)

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.

[–] [email protected] 1 points 11 months ago

Whether or not you need to escape parens depends on the regex implementation.

[–] lemmington_steele 3 points 11 months ago

yeah but by Cantor's diagonal argument, you still wouldn't be listing all the real numbers

[–] Stupidmanager 3 points 11 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 1 points 11 months ago (1 children)

What about imaginary numbers?

[–] [email protected] 2 points 11 months ago

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

I'm not making one for mixed numbers