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string.find(string, pattern|pattern) -- ????

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Posted by ThumpieBunnyEve   (10 posts)  [Biography] bio
Date Sat 16 May 2009 07:00 PM (UTC)

Amended on Sat 16 May 2009 07:02 PM (UTC) by ThumpieBunnyEve

No matter what i do in a Lua script, i cant get a pattern to include an OR.

solo = "http://ggg.cnn.com http://www.cnn.com www.cnn.com monkey-tribble-duck w.cnn.com w  ww oog.nomface.com www wwww w|www wW  W WW WWW  ouote o.ote.com.nom ___ gggg quote q.ote.com.nom.con WWWW  WWW. http://www.cnn.com"

luke = "([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/])|([wW]+[wW]+[wW]+[\.])"

leia = "[hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/]|[wW]+[wW]+[wW]+[\.]"

r2d2 = "(([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/])|([wW]+[wW]+[wW]+[\.]))"

c3p0 = "([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/])*([wW]+[wW]+[wW]+[\.])*([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/])"

jaba = "(([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/])*([wW]+[wW]+[wW]+[\.])*([hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/]))"

boba = "[hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/]*[wW]+[wW]+[wW]+[\.]*[hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/]"

yoda = string.find(solo, luke) -- fails
yoda = string.find(solo, leia) -- fails
yoda = string.find(solo, r2d2) -- fails
yoda = string.find(solo, c3p0) -- fails
yoda = string.find(solo, jaba) -- fails
yoda = string.find(solo, boba) -- fails

I'm out of options here X_X;
There is no way to put an OR into the pattern of a string.find is there?
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Posted by WillFa   USA  (525 posts)  [Biography] bio
Date Reply #1 on Sat 16 May 2009 08:06 PM (UTC)

Amended on Sat 16 May 2009 08:22 PM (UTC) by WillFa

Lua pattern matching isn't the same as PCRE. The rex library has all the pcre syntax you're looking for.

The simple answer to your question is "No. Use 'or' between 2 string.find calls" :)

yoda = string.find(solo, "[hHtTpPsSmMaAiIlLoO]+://[%S]*[%w#/]") 
   or string.find(solo, "www") or string.find(solo, "WWW")

Lua Pattern matching doesn't support an | as "OR", or {}s for repetition quantifiers (i.e. %w{2,3} doesn't match at least 2 but no more than 3 alpha chars.)

Lua patterns tend to run a bit faster, since they're more simplistic. The speed of the language generally matches or exceeds the speed of compiling a rex regexp.

function IsUrl (darth)
 local vader = darth:lower()
  if vader:find("^http://") or vader:find("^mailto://") 
      or vader:find("^www") then 
   return true

That should accomplish what you're looking for.
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Posted by Nick Gammon   Australia  (21,674 posts)  [Biography] bio   Forum Administrator
Date Reply #2 on Sun 17 May 2009 05:11 AM (UTC)
You can also use LPEG to match on patterns with more complex conditions, like this or that.


- Nick Gammon

www.gammon.com.au, www.mushclient.com
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