Re: newb: Simple regex problem headache
On Sep 21, 2007, at 4:04 PM, crybaby wrote:
> import re
>
> s1 =' 25000 '
> s2 = ' 5.5910 '
>
> mypat = re.compile('[0-9]*(\.[0-9]*|$)')
> rate= mypat.search(s1)
> print rate.group()
>
> rate=mypat.search(s2)
> print rate.group()
> rate = mypat.search(s1)
> price = float(rate.group())
> print price
>
> I get an error when it hits the whole number, that is in this format:
> s1 =' 25000 '
> For whole number s2, mypat catching empty string. I want it to give
> me 25000.
> I am getting this error:
>
> price = float(rate.group())
> ValueError: empty string for float()
>
> Anyone knows, how I can get 25000 out of s2 = ' 5.5910 '
> using regex pattern, mypat = re.compile('[0-9]*(\.[0-9]*|$)'). mypat
> works fine for real numbers, but doesn't work for whole numbers.
I'm not sure what you just said makes a lot of sense, but if all your
looking for is a regex that will match number strings with or without
a decimal point, try '\d*\.?\d*'
Erik Jones
Software Developer | Emma®
[EMAIL PROTECTED]
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Re: newb: Simple regex problem headache
crybaby wrote:
> import re
>
> s1 =' 25000 '
> s2 = ' 5.5910 '
>
> mypat = re.compile('[0-9]*(\.[0-9]*|$)')
> rate= mypat.search(s1)
> print rate.group()
>
> rate=mypat.search(s2)
> print rate.group()
> rate = mypat.search(s1)
> price = float(rate.group())
> print price
>
> I get an error when it hits the whole number, that is in this format:
> s1 =' 25000 '
> For whole number s2, mypat catching empty string. I want it to give
> me 25000.
> I am getting this error:
>
> price = float(rate.group())
> ValueError: empty string for float()
>
> Anyone knows, how I can get 25000 out of s2 = ' 5.5910 '
> using regex pattern, mypat = re.compile('[0-9]*(\.[0-9]*|$)'). mypat
> works fine for real numbers, but doesn't work for whole numbers.
>
> thanks
>
Try this:
>>> import re
>>> s1 =' 25000 '
>>> s2 = ' 5.5910 '
>>> num_pat = re.compile(r'([0-9]+(\.[0-9]+)?)')
>>> num_pat.search(s1).group(1)
'25000'
>>> num_pat.search(s2).group(1)
'5.5910'
Ian
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Re: newb: Simple regex problem headache
On Sep 21, 5:04 pm, crybaby <[EMAIL PROTECTED]> wrote:
> import re
>
> s1 =' 25000 '
> s2 = ' 5.5910 '
>
> mypat = re.compile('[0-9]*(\.[0-9]*|$)')
> rate= mypat.search(s1)
> print rate.group()
>
> rate=mypat.search(s2)
> print rate.group()
> rate = mypat.search(s1)
> price = float(rate.group())
> print price
>
> I get an error when it hits the whole number, that is in this format:
> s1 =' 25000 '
> For whole number s2, mypat catching empty string. I want it to give
> me 25000.
> I am getting this error:
>
> price = float(rate.group())
> ValueError: empty string for float()
>
> Anyone knows, how I can get 25000 out of s2 = ' 5.5910 '
> using regex pattern, mypat = re.compile('[0-9]*(\.[0-9]*|$)'). mypat
> works fine for real numbers, but doesn't work for whole numbers.
>
> thanks
Your pattern matches the empty string a bit too well, if you know what
I mean!
Changing the regex slightly to '[0-9]+(\.[0-9]+)?' yields the results
you want:
25000
5.5910
25000.0
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newb: Simple regex problem headache
import re
s1 =' 25000 '
s2 = ' 5.5910 '
mypat = re.compile('[0-9]*(\.[0-9]*|$)')
rate= mypat.search(s1)
print rate.group()
rate=mypat.search(s2)
print rate.group()
rate = mypat.search(s1)
price = float(rate.group())
print price
I get an error when it hits the whole number, that is in this format:
s1 =' 25000 '
For whole number s2, mypat catching empty string. I want it to give
me 25000.
I am getting this error:
price = float(rate.group())
ValueError: empty string for float()
Anyone knows, how I can get 25000 out of s2 = ' 5.5910 '
using regex pattern, mypat = re.compile('[0-9]*(\.[0-9]*|$)'). mypat
works fine for real numbers, but doesn't work for whole numbers.
thanks
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