Gammon Forum : MUSHclient : Lua : string.find(string, pattern|pattern) -- ????

Log on

Gammon Forum

Entire forum

MUSHclient

Lua

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

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

It is now over 60 days since the last post. This thread is closed. Refresh page

Posted by ThumpieBunnyEve (10 posts) bio

Date

Sat 16 May 2009 07:00 PM (UTC)

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?

top

Posted by WillFa USA (525 posts) 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

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.

top

Posted by

Nick Gammon Australia (22,975 posts)

bio Forum Administrator

Date

Reply #2 on Sun 17 May 2009 05:11 AM (UTC)

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

top

The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).

To show them in your local time you can join the forum, and then set the 'time correction' field in your profile to the number of hours difference between your location and UTC time.

16,382 views.

It is now over 60 days since the last post. This thread is closed. Refresh page

Go to topic: Search the forum

top

Quick links: MUSHclient. MUSHclient help. Forum shortcuts. Posting templates. Lua modules. Lua documentation.

Information and images on this site are licensed under the Creative Commons Attribution 3.0 Australia License unless stated otherwise.