From: Brian Candler <lists@...>
Date: 2012-07-13T04:46:22+09:00
Subject: Re: how to check string is numeric or not

Aleksey Zapparov wrote in post #1068416:
> On Thu, 12 Jul 2012 19:16:08 +0900
> Lucky Nl <lists@ruby-forum.com> wrote:
>
>> check these
> def is_numeric(o)
>     true if Integer(o) rescue false
>   end

This may not be exactly what is wanted:

>> Integer("0x123")
=> 291

If you just want to allow digits and nothing else, use a regexp: 
/\A\d+\z/ =~ o

Also, note that "is_numeric" isn't an ideal name, because Numeric 
includes Float.

>> Float.ancestors
=> [Float, Precision, Numeric, Comparable, Object, Kernel]

-- 
Posted via http://www.ruby-forum.com/.