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Top Forums Shell Programming and Scripting Perl code to differentiate numeric and non-numeric input Post 302109145 by cbkihong on Saturday 3rd of March 2007 08:22:26 PM
Old 03-03-2007
The most common way:
Use regular expression.

Alternative (probably a better) way:
Code:
cbkihong@cbkihong:~$ perl -MScalar::Util -e 
'print(Scalar::Util::looks_like_number("-8.90e10")?"Looks like a number.\n":"Not a number.\n")'
Looks like a number.
cbkihong@cbkihong:~$ perl -MScalar::Util -e 
'print(Scalar::Util::looks_like_number("89d")?"Looks like a number.\n":"Not a number.\n")'
Not a number.

 

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autobox::List::Util(3pm)				User Contributed Perl Documentation				  autobox::List::Util(3pm)

NAME
autobox::List::Util - bring the List::Util functions to autobox VERSION
Version 20090629 SYNOPSIS
"autobox::List::Util" brings all of the functions from List::Util to arrays as methods. use autobox::List::Util; my @array = qw/ foo bar baz /; print @array->first(sub { /ar/ }), " "; # "bar" print [5, 6, 3, 4]->max, " "; # 6 print @array->maxstr, " "; # baz print [5, 6, 3, 4]->min, " "; # 3 print @array->minstr, " "; # foo print [1 .. 10]->shuffle, " "; #1 to 10 randomly shuffled print [1 .. 10]->sum, " "; # 55 print [1 .. 10]->reduce( sub { $a + $b } ), " "; # 55 METHODS
first(coderef) This method behaves nearly the same as the first function from List::Util, but it takes a coderef not a block because methods can't use prototypes. reduce(coderef) This method behaves nearly the same as the reduce function from List::Util, but it takes a coderef not a block for the same reason. It also has a bug (see BUGS) shuffle If called in scalar context it returns a reference to an array instead of a list. This allows shuffle to be chained with other calls. max, maxstr, min, minstr, sum These methods behave exactly the same as their List::Util counterparts. AUTHOR
Chas. J. Owens IV, "<chas.owens at gmail.com>" BUGS
The reduce method works with $main::a and $main::b, not your current package's $a and $b, so you need to say print @array->reduce( sub { $main::a + $main::b } ), " "; if you are not in the main package. Reduce uses $_, so it doesn't suffer from this problem. SUPPORT
You can find documentation for this module with the perldoc command. perldoc autobox::List::Util You can also look for information at: o RT: CPAN's request tracker <http://rt.cpan.org/NoAuth/Bugs.html?Dist=autobox-List-Util> o AnnoCPAN: Annotated CPAN documentation <http://annocpan.org/dist/autobox-List-Util> o CPAN Ratings <http://cpanratings.perl.org/d/autobox-List-Util> o Search CPAN <http://search.cpan.org/dist/autobox-List-Util/> ACKNOWLEDGEMENTS
COPYRIGHT &; LICENSE Copyright 2009 Chas. J. Owens IV, all rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-04-17 autobox::List::Util(3pm)
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