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Regular Expressions

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Posted by LupusFatalis   (154 posts)  [Biography] bio
Date Sat 24 Apr 2010 06:51 AM (UTC)  [ quote  ]

Amended on Sat 24 Apr 2010 07:15 AM (UTC) by LupusFatalis

Message
Ultimately what I'm trying to do here is match a string against a list of regular expressions and have a second list of strings to substitute.
function process_name (room_name)

	-- long regular expressions [ordered]
	reName = {"^(A|An) (somewhat |very |very very |extremely )?(small |large )?cave$",
			"^(A|An) (somewhat |very |very very |extremely )?(small |large )?cavern$",
			"^(A|An) (somewhat |very |very very |extremely )?(small |large )?tunnel$"}

	-- short strings [ordered]
	sName = {"A cave",
			"A cavern",
			"A tunnel"}

	--Convert matched long regular expressions to corresponding short strings
	for i,item in ipairs(reName) do
		room_name = rex.gsub(room_name, item, sName[i])
	end

	return roon_name

I've tried a bunch of things now, and I just can't seem to get it to work properly.

Though, this seems to indicate I'm doing it correctly: http://math2.org/luasearch/rex.html#rex_gsub
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Posted by Nick Gammon   Australia  (18,770 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Sun 25 Apr 2010 01:33 AM (UTC)  [ quote  ]

Amended on Sun 25 Apr 2010 01:34 AM (UTC) by Nick Gammon

Message
This seems to work OK:


function process_name (room_name)

  -- long regular expressions [ordered]
  reName = {"^(A|An) (somewhat |very |very very |extremely )?(small |large )?cave$",
      "^(A|An) (somewhat |very |very very |extremely )?(small |large )?cavern$",
      "^(A|An) (somewhat |very |very very |extremely )?(small |large )?tunnel$"}

  -- short strings [ordered]
  sName = {"A cave",
      "A cavern",
      "A tunnel"}

  -- If a match, return corresponding short strings
  for i,item in ipairs(reName) do
    if rex.new (item):match (room_name) then
       return sName [i]
    end -- if
  end  -- for

  return roon_name

end -- function

-- tests

print (process_name ("A somewhat large cave"))   --> A cave
print (process_name ("A somewhat small cavern"))  --> A cavern
print (process_name ("An extremely large tunnel"))  --> A tunnel

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by LupusFatalis   (154 posts)  [Biography] bio
Date Reply #2 on Sun 25 Apr 2010 03:04 PM (UTC)  [ quote  ]
Message
Works brilliantly, thanks Nick!
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