Negative numbers, scientific notation, any other oddball cases
I'm not thinking of. They'd all be reasonably easy to cobble in,
but it's the "I'm not thinking of" part that I was trying to avoid.
-glenn
Kevin Clark wrote:
/\d+(\.\d+)?/ =~ some_number
Doesn't do what you need? Is there an obvious edge case I'm missing? A
number is one or more digits, optionally followed by a . and one or
more digits.
=~ will give you nil if it doesn't match, or the index of the match if
it does (which you can just use as non false).
On Fri, Jan 22, 2010 at 11:35 AM, Glenn Little <[email protected]> wrote:
I'm looking for a simple way to check if a string really represents
a number in ruby/rails. I figured there would be a String.is_numeric?
but haven't found anything.
I've seen suggestions for roll-your-own functions the best of which
appears to be something like (verbosely):
def represents_number?(s)
begin
if Float(s)
return true
else
return false
end
rescue
return false
end
end
This relies on the fact that Float() throws an exception if it
gets a string that it can't convert.
The issue I have with this is that it feels a little hinky in
that it's relying on Float throwing an exception. Maybe that's
okay, but it feels just a shade side-effecty.
The other option is to craft a regexp, which would be tough
if I *really* wanted to be thorough.
Am I missing any simpler options?
Thanks...
-glenn
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