It sort of depends on what your string looks like, but here is one solution:
my $string = "one two three four five six seven eight nine ten eleven
+twelve thirteen";
my( $left, $right );
if( ( $left, $right ) = $string =~ m{\A((?:\S+\s){11})(.+)\z} ) {
say "Left: ($left)";
say "Right: ($right)";
}
Output:
Left: (one two three four five six seven eight nine ten eleven )
Right: (twelve thirteen)
If you want to gobble that eleventh space, this will do it:
m{\A((?:(\S+\s){10}\S+)\s(.+)\z}
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