# Perl validating numbers

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### Validating numbers Perl

Common manpage, but more detailed documentation for just the numeric patterns is in the Regexp:: Also, execution times could be much faster if there were a perlfunction "isreal" that returned the result; and since so many operations built into perl must have to know weather the scalar is real or not anyway, I don't see why it isn't Perl validating numbers a function Problem You want to check whether a string represents a valid number. The only way I can think of to make it work for numbers in sci-notation would be to use a regular expression. Its semantics are cumbersome, so the following is a getnum wrapper function for more convenient access.

Last Activity: Some techniques for identifying numbers don't involve regular expressions. General documentation for the module can be found in the Regexp:: Here's an alternative that I think may execute more quickly than using a regular expression or loading in an additional module and identifies decimal numbers Solution Compare it against a regular expression that matches the kinds of numbers you're interested in: Either add the appropriate logic directly, or call the trim function from Recipe 1.

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Util up to v1. For something as fundamental as this it really should Pedl. Common, including the Regexp:: Of course, these functions limit you to the definition of "number" offered by your libraries and Perl. Common provides a wealth of canned patterns that test whether a string looks like a number. You could update the regex to accept an optional minus:

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