Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Re: check if its a number

by snoopy (Deacon)
on Apr 12, 2008 at 00:33 UTC ( #679901=note: print w/ replies, xml ) Need Help??


in reply to check if its a number

Scalar::Util's looks_like_number method will do what you want.

If you need to distinguish integers from float; see also Scalar::Util::Numeric


Comment on Re: check if its a number
Re^2: check if its a number
by oko1 (Deacon) on Apr 12, 2008 at 02:22 UTC
    > Scalar::Util's looks_like_number method will do what you want.
    

    Scalar::Util uses a regex to get the answer. I'm not sure why snoopy's request has that requirement, but...

    ben@Tyr:~$ perl -wne'print if /sub looks_like_number/../}/' `perldoc - +l Scalar::Util` sub looks_like_number { local $_ = shift; # checks from perlfaq4 return 0 if !defined($_) or ref($_); return 1 if (/^[+-]?\d+$/); # is a +/- integer return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # +a C float return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006 +001 and /^Inf$/i); 0; }
    
    -- 
    Human history becomes more and more a race between education and catastrophe. -- HG Wells
    

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://679901]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (15)
As of 2015-07-01 16:14 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (9 votes), past polls