From: Nuralanur@...
Date: 2006-06-01T19:18:16+09:00
Subject: Re: How I can check number?

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How I can to  check float value, with regular expression. Also need check 
a integer with  float values.


I do not know exactly what you mean by this:
do you want to find a string that could represent a float (resp.  integer) 
number
in a text ?
That could be a string made up of 
- an arbitrary number of 0,1,..,9 , followed by a dot, followed by an  
arbitrary number
  of 0,1,2,...,9 in case of a float number,
- an arbitrary number of 0,1,..,9 in case of an integer number.
 
Then, you could do this
 
class String
def  scan_for_numbers
int_regexp=/\+*\-*[0-9]+/
fl_regexp=/\+*\-*[0-9]+\.[0-9]+/
 
         temp=self.dup
floats=temp.scan(fl_regexp)
floats.each{|x| temp.gsub!(x,'')}
ints=temp.scan(int_regexp)
all_numbers={}
floats.each{|x|  all_numbers.update({x,' is a floating point  number!'})}
ints.each{|x|   all_numbers.update({x,' is an integer  number!'})}
return  all_numbers
end
end
 
a_long_text='my bank account is -100000000.09 dollars, but I earn 1 dollar  a 
day, which is better than earning 0.50 dollars or 0 dollars.'
 

b=a_long_text.scan_for_numbers
puts b

----------------------------------------------------------
gives: 
-100000000.09 is a floating point number!0 is an integer number!1 is an  
integer number!0.50 is a floating point number!

Best regards,
 
Axel 

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