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if ($sentence =~ /foo/gis && $sentence =~ /bar/gis)
{
   # do something further with $sentence 
}

if ($sentence =~ /foo/gis)
{
...
      # now do something with the sentence
   }
}

if ($sentence =~ /foo/gis)
{
...
       # *now* do something with the sentence...
    }
}