Your problem appears to be that $NetPattern doesn't contain the slashes you think it does. You have two choices: 
$NetPattern = qr{mbist[\w+\d+\/]*\[\d+\]}x;
if ($NetName =~  $NetPattern) {# Do fantastical things...}

[download]
$NetPattern = 'mbist[\w+\d+\/]*\[\d+\]';
if ($NetName =~ qr/$NetPattern/x) {# Do fantastical things...}

[download]

The "" style quotes interpolated your slashes away.

The qr is also most useful (in my opinion) for precompiling regular expressions, so I would choose the first solution, particularly if you have a lot of matches to do on that single regular expression. It's also nice for being able to tell that $NetPattern is of type Regexp. So, I guess there's also this third choice... 

$NetPattern = 'mbist[\w+\d+\/]*\[\d+\]';
if ($NetName =~ m/$NetPattern/x) {# Do fantastical things...}

[download]

-Paul

In reply to Re: Comparing two variables when one variable includes a regexp... by jettero
in thread Comparing two variables when one variable includes a regexp... by fiddler42

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