Unfortunately perl does not have any built-in functions to
do just this.
One way you could check it is by seeing if perl warns
"... is not numeric ..." when you try to do something
with a value:
# numeric -- returns true if arg. is numeric
sub numeric {
my $value = shift;
my $result = 1;
local $^W = 1; # turn warnings on if they aren't already.
local $SIG{__WARN__} = sub { $result = 0 };
# if we get a warning make $result false
$value += 0;
return $result;
}
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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