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

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Subject:	string.find(string, pattern\|pattern) -- ????
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Message:	[quote=ThumpieBunnyEve] No matter what i do in a Lua script, i cant get a pattern to include an OR. [code] 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 [/code] 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? [/quote] Message to be posted (in English, please).
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Posted by

Nick Gammon Australia (18,772 posts)

bio Forum Administrator

Date

Sun 17 May 2009 05:11 AM (UTC) [ quote ]

Message

You can also use LPEG to match on patterns with more complex conditions, like this or that.

http://www.gammon.com.au/forum/?id=8683

- Nick Gammon

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

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Posted by WillFa USA (517 posts) bio

Date

Sat 16 May 2009 08:06 PM (UTC) [ quote ]

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

Message

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
 end
end

That should accomplish what you're looking for.

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Posted by ThumpieBunnyEve (10 posts) bio

Date

Sat 16 May 2009 07:00 PM (UTC) [ quote ]

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

Message

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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