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  1. or download this
    /(?<!ss)/i
  2. or download this
    /(?<!ß|ss)/i
  3. or download this
        ßtabc
   SSTABC
    STABC
  4. or download this
    /(?<!s)tart/i ;

/(?<![Ss])[Tt][Aa][Rr][Tt]/ ;
  5. or download this
    my $not_s= qr/(?<![Ss])/; # no explicit /i here, will never match insi
+de ß
my $rest= qr/abc/i;
my $pattern= "$not_s$rest";

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