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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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Mouse::Util(3pm)					User Contributed Perl Documentation					  Mouse::Util(3pm)

NAME
Mouse::Util - Utilities for working with Mouse classes VERSION
This document describes Mouse version 0.99 SYNOPSIS
use Mouse::Util; # turns on strict and warnings DESCRIPTION
This module provides a set of utility functions. Many of these functions are intended for use in Mouse itself or MouseX modules, but some of them may be useful for use in your own code. IMPLEMENTATIONS FOR
Moose::Util functions The following functions are exportable. "find_meta($class_or_obj)" The same as "Mouse::Util::class_of()". "does_role($class_or_obj, $role_or_obj)" "resolve_metaclass_alias($category, $name, %options)" "apply_all_roles($applicant, @roles)" "english_listi(@items)" Class::MOP functions The following functions are not exportable. "Mouse::Util::is_class_loaded($classname) -> Bool" Returns whether $classname is actually loaded or not. It uses a heuristic which involves checking for the existence of $VERSION, @ISA, and any locally-defined method. "Mouse::Util::load_class($classname) -> ClassName" This will load a given $classname (or die if it is not loadable). This function can be used in place of tricks like "eval "use $module ()"" or using "require". "Mouse::Util::class_of($classname_or_object) -> MetaClass" "Mouse::Util::get_metaclass_by_name($classname) -> MetaClass" "Mouse::Util::get_all_metaclass_instances() -> (MetaClasses)" "Mouse::Util::get_all_metaclass_names() -> (ClassNames)" mro (or MRO::Compat) "get_linear_isa" Sub::Identify "get_code_info" Mouse specific utilities "not_supported" "get_code_package" "get_code_ref" SEE ALSO
Moose::Util Class::MOP Sub::Identify mro MRO::Compat perl v5.14.2 2012-06-30 Mouse::Util(3pm)
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