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  1. or download this
    if ($_ =~ /^S\s+[-]*\d+[\.\d+]*\s+[-]*\d+[\.\d+]*\s*\(\s*IOPUT|OUTPUT\
+s*\)/i)
  {
    print "PRE=$`\nMATCH=$&\nPOST=$'\nIt matches with case insensitive
+...\n";
  }
  2. or download this
    PRE=  onn (bbcreccsnnl_
MATCH=output)
POST= !OUTPUT
It matches with case insensitive...