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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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