Exact # of digits regular ex.

[JNameNotTaken]

Hi All

Sorry to have to ask this. but it's been driving me daft for the last few hours.

I need to verify that a scaler contains only digits and only 12 of them at that.

I've tried these (among others) to no avail:

if( $variable =~ m/\d\d\d\d\d\d\d\d\d\d\d\d/ )

if( $variable = /\d\d\d\d\d\d\d\d\d\d\d\d/ )

but those just won't work correctly, the number of digits entered can be any number and it will return true.

Any help will help keep me sane, thanks very much.

 

[jrig]

$variable='123456789012';
       
if( $variable =~ /^\d{12}$/ ){print 'got a twelver';}
else                         {print 'no dice';}

Works for me!

 

[KevinADC]

use string anchors like jrig does above:

^ - beginning of string
$ - end of string

otherwise all you are doing is checking if there are digits anywhere in the string.


- Kevin, perl coder unexceptional!

 

[JNameNotTaken]

Thank you both, I really appreciate that information.