I would like to write a regular expression that would only accept valid input that would qualify as a port number. I want to only accept input for the characters 0-9 and no special characters. The number should not be longer than 5 characters.
I read user input using this method.
my $port_number = <>;
I know that the regular expression should look something like this.
^[0-9]*$
How do I combine the regular expression with the reading of the command line input without using an if statement?
Try this code:
$result = ($port_number =~ m/^[0-9]{1,5}$/);
$result
will be set to 1 if the $port_number
matches your criteria, and will be set to 0 otherwise.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.