simple scratch variable parsing

[Grant]

Hello! I've got scratch variables like:

c1
sc1
sr1

The letters involved should either be "c", "sc", or "sr", and the
number(s) could be any. This is pulled from the URL, and I'd like to
make sure it's formed correctly, so I'd rather not just filter it for
letters and filter it for numbers. It seems like I'd need to check it
character by character? How can I do this? I'm a Perl newbie.
Thanks!

- Grant

 

[Tad McClellan]

Hello! I've got scratch variables like:

How is a "scratch variable" different from a "variable"?

c1
sc1
sr1

Those are not variables. Variables in Perl have sigils.

Those are probably values rather than variables.

The letters involved should either be "c", "sc", or "sr", and the
number(s) could be any. This is pulled from the URL, and I'd like to
make sure it's formed correctly, so I'd rather not just filter it for
letters and filter it for numbers. It seems like I'd need to check it
character by character? How can I do this?

if ( $scratch =~ /^(c|sc|sr)\d+$/ )
{ print "valid\n" }
else
{ print "not valid\n" }

 

[Grant]

How is a "scratch variable" different from a "variable"?




Those are not variables. Variables in Perl have sigils.

Those are probably values rather than variables.




if ( $scratch =~ /^(c|sc|sr)\d+$/ )
{ print "valid\n" }
else
{ print "not valid\n" }

Thank you very much Tad!

- Grant