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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]+/
 
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