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Re^2: Floating Point/Integer Regular Expression

by shortyfw06 (Beadle)
on Jul 25, 2012 at 15:46 UTC ( #983691=note: print w/replies, xml ) Need Help??


in reply to Re: Floating Point/Integer Regular Expression
in thread Floating Point/Integer Regular Expression

Thank you. That is a useful function! I ended up answering my own question for a regex that includes negative/positive integers and negative/positive floating points.

/^(?:|-|\d+|-\d+|\d+.|-\d+\.|\d+\.\d+|-\d+\.\d+)$/

And just for clarification, this is used as a -validatecommand.

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Re^3: Floating Point/Integer Regular Expression
by tobyink (Abbot) on Jul 25, 2012 at 23:45 UTC

    Did you know that regexp matches:

    • -
    • 1.

    But fails to match:

    • .1
    • -.1

    You might want to try this. It's somewhat simpler than yours, and it disallows the single hyphen, but allows decimals which start with the decimal point and no preceding 0.

    /^[-]?(?:[.]\d+|\d+(?:[.]\d*)?)$/

    Or if you consider a leading/trailing decimal point to be an error, it can be made simpler:

    /^[-]?\d+(?:[.]\d+)?$/
    perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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[choroba]: but undef %hash and %hash = () both work, too, but the first one keeps the memory allocated, while the latter makes it available for other parts of the program.
[choroba]: iirc
[perldigious]: karlgoethebier: Well it is a pretty old and complicated (for me) bit of code I wrote (poorly by my current standards), so I'm expecting everything to break when I add the scoping and find out what else is undesireably scope changed. :-)
[perldigious]: Ah, thanks choroba, that sort of thing was precisely what I was wondering when I asked.
[perldigious]: I didn't want to tie up memory unecessarily basically, I wanted to "delete" it specifically to free it up, and wasn't sure I was even accomplishing that.
[stevieb]: perldigious You should start by writing some unit tests. That'll ensure current functionality doesn't break with changes.

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