As others have said, eval is your friend.
I have used eval once to catch division by zero, see Re: Stereotypes about perl. Here's the relevant snippet from it:
eval {
drr (
@$zb-1-$p[2][1], @$zb-1-$p[3][1],
$p[2][0], $p[2][0],
-($p[3][0]-$p[2][0])/($p[3][1]-$p[2][1]),
-($p[1][0]-$p[2][0])/($p[1][1]-$p[2][1]),
$p[2][2],
-($p[3][2]-$p[2][2])/($p[3][1]-$p[2][1]),
($p[1][2]-$p[3][2])/($p[1][0]-$p[3][0]),
$col, $zb
);
}; $@ and do {
$@=~m/division by zero/ or die $@;
};
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