WoWInterface - Pattern matching is my Kryptonite!

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Pattern matching is my Kryptonite!

I am writing an external AddOn that converts invalid itemID lists into valid ones for TradeSkillMaster. However, for all that I have been reading on wowpedia.org and the official Lua documentation, I am stuck on matching exactly what I want in strings.

These are valid for TSM:

"i:82977"
"i:82977,i:10368"

While these are not valid:

"82977"
"82977,10368"

TSM requires itemIDs in the format "i:12345" and comma seperated if there are more than one. Okay, great. I can use string.gmatch (I don't care about what position the numbers are, so I'm not using string.match) like so:

Code:

local maybe_valid = string.gmatch(myString, "%d+$"

But that will match both examples above, valid and not valid. That won't work. How do I force the match to start at the first character of the string?

Checking if it is valid is easy, I think.

Code:

local valid = string.gmatch(myString, "i:%d+$"

The reason for knowing the difference is that after finding invalid strings, I will use string.gsub(myString, ",", ",i:") to fix them. Clearly I don't want to fix a string that is already valid.

Would the following work, or does this need to be more complex?

Code:

local valid = string.gmatch(myString, "i:%d+$")

if not valid then

    myString = string.gsub(myString, ",", ",i:")

    myString = "i:" .. myString

end

It's not my forte so this is probably not very efficient if it does work.

Code:

local valid = string.gsub(myString, "[i:]+[0-9]+", replaceString)

As for finding valid and invalid (turns out I need both, but need to know the difference) this might work:

Code:

local valid = true

for w in string.gmatch(text_store, "%d+") do

    if string.gmatch(w, "i:%d+") then

        valid = true

    else

        valid = false

        break -- we only need to find one incorrect itemID. no point in continuing

    end

end

How about making everything wrong and fixing it all:

Code:

s = "I:1234,3450,i:9867"

s1 = string.gsub(string.gsub(s, "[iI]:", ""), "(%d+)", "i:%1")

print(s1)

i:1234,i:3450,i:9867

:rolleyes:

Quote:

Originally Posted by krowbar71 (Post 331370)

How about making everything wrong and fixing it all:

Code:

s = "I:1234,3450,i:9867"

s1 = string.gsub(string.gsub(s, "[iI]:", ""), "(%d+)", "i:%1")

print(s1)

i:1234,i:3450,i:9867

:rolleyes:

Damn... :eek: