Validation digit and string ? How ?

Junior WebHelper Joined: 22 Feb 2002 Posts: 20

how to check a variable is a string or a digit

using perl ?

WebHelper Joined: 01 Mar 2003 Posts: 69 Location: Texas

What are you actually trying to do? Perl doesn't care; it will convert numbers to characters and characters to numbers when it needs to.

If you want to figure out if a string contains nothing but numeric entries, you could use

Code:

$foo =~ tr/0-9//d;

and then take the length of the remaining string. This command (I think, anyway) will take $foo and remove all numeric characters. Suppose $foo contains 1234ABC. What's left after this is ABC. If $foo contains 1234, what's left is an empty string. Therefore the item is numeric.