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qr{(?smx)
    \.?   # Match the first instance of 0 or 1 one periods
...
     \S+  # one or more non whitespace characters
    )
  }

qr{(?smx)
   \.   # Find a full stop
   (.*) # and capture everything after it
  }

qr{(?smx)
  ^      # From the beginning
...
  )?     # math the group 0 or 1 times
  (.*)   # then capture everything else
  }