In the case you provided, you would do something like this:
( $foo ) = split ( /\./, $bar );
By wrapping the left hand side in parens, you put the assignment into list context, and the first element of that list is stored in $foo.
For more complex cases, sometimes its helpful to wrap the right-hand-side in parens, and then index into the element that you want returned:
$foo = ( split ( /\./, $bar ) )[0];
The latter method would allow you to return several elements at once. You could even do this:
( $foo, $boo ) = ( split ( /\./, $bar ) )[ 1, 0 ];
...which would return the 2nd element to $foo, and the 1st element to $boo.
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