sort array

[welle]

Hello Monks,

I need your help. I have an array containing sentences. I want to order the sentences according to a given word (i.e. the third from the left).

I am a nice boy You are a nice boy They are not good at all

What I found is the following (adapting it from Lingua::Concordancer):

sub order_line{  
    my @sorted_lines;
    foreach ( sort { _by_left( $a, $b ) } @lines ) { push @sorted_line
+s, $_ }
    print @sorted_lines;
}

sub _by_left {
    my ( $a, $b ) = @_;
    return lc( _on_left(  $a )) cmp lc( _on_left( $b )); 
    
}

sub _on_left {
    my ( $s ) = @_;
    my @words = split( /\s+/);
    my $word_level=3;
    return  $words[ scalar( @words ) - $word_level ];
}

Of course it doesn't work...