c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my @strings = (
   'SMS,SMS1,20190811',
   'SMS,SMSh,20190811',
   'SMS,SMSH,20190811',
   'SMS,SMSx,20190811',
   'SMS,SMSi,20190811',
   'SMS,SMSX,20190811',
   'SMS,SMSI,20190811',
   );
 ;;
 for my $s (@strings) {
   my $ref_s = \$s;
   $$ref_s = 'SMSblk'
     if $$ref_s =~ /SMSi/i
     || $$ref_s =~ /SMSI/i
     || $$ref_s =~ /SMSh/i
     || $$ref_s =~ /SMSH/i
     || $$ref_s =~ /SMS1/
     ;
   }
 ;;
 dd \@strings;
"
[
  "SMSblk",
  "SMSblk",
  "SMSblk",
  "SMS,SMSx,20190811",
  "SMSblk",
  "SMS,SMSX,20190811",
  "SMSblk",
]