can you substitute equation with variable?

[Richard Lee]

say something like == or eq ..

Can you sub them w/ varilable like $unknown   ?
Let me be more specific.
Let's say I don't know what the variable will hold

I guess I can say something like,

sub check_unknown {
       my $unknown = shift;   ## it's either digits or letters but both 
will be same kind
       my $unknown1 = shift; ## it's either digits or letters

      my $result = ( $unknown =~ /^\d+$/ ) ? '==' : 'eq';
       if ( $unknown $result $unknown1 ) {
                    do something...
       }
}

But obviously above dont work.. can someone shed some light on this?

thanks!

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