From: Robert Klemme <shortcutter@...>
Date: 2012-12-08T20:02:54+09:00
Subject: Re: Extract number (float) from string

On Tue, Dec 4, 2012 at 9:01 PM, botp <botpena@gmail.com> wrote:
> On Wed, Dec 5, 2012 at 2:31 AM, Alexander G. <lists@ruby-forum.com> wrote:
>>
>> how to extract exact number from string:
>> $5.99 /LB
>> need to get 5.99 as float number
>
>
> see ri String#slice
>
> eg,
>
>>"$5.99 /LB"[/[\d.]+/].to_f
> => 5.99

That's a quite lazy match which will also try to convert "...." into a
float.  We can do more specific:

irb(main):002:0> "$5.99 /LB"[/\d+\.\d+/].to_f
=> 5.99

Or, more thoroughly:

irb(main):004:0> "$5.99 /LB"[/[-+]?\d+(?:\.\d+)?/].to_f
=> 5.99


But I agree with sto.mar that storing currency values in a float is a bad idea.

Kind regards

robert

--
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