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  1. or download this
    
my $n =  # choose your rgx number
...

my $rgx2 = qr/^\s/;
  2. or download this
    
# $rgx3 is untested, but provided for example.
...
            (.*?\.)   # $2 - the sentence
             )/x;     # end $1 and regex
  3. or download this
    
my $regex = $n == 1 ? $rgx1 : $n==2 ? $rgx2 : $rgx3 ;
...
   # untested. thx to Cristoforo for idea of tr in e
}