if ($Session->{'usrType'} eq 'Pro') and 
    ($Session->{'usrSystem' =~/SEF/VAL/SUM/SAR/MRT/ALB/MRE/VER/RML/AUS/ORG/MSX/BAR/LAS/)
{do something}

##</code><code>##

if ( ($Session->{'usrType'} eq 'Pro') and 
    ($Session->{'usrSystem'} =~/SEF/VAL/SUM/SAR/MRT/ALB/MRE/VER/RML/AUS/ORG/MSX/BAR/LAS/))
{do something}