HELP: Finding 'things inside strings'.

[MTA.Castiel]

Hello, im trying to output a 4 digit code from a random string but there is some error so i change > local theFoundCode = string.find(theCodeString, "%d%d%d%d") to local theFoundCode = string.find(theCodeString, "%d") and now it output "8". I'm trying to use string.find and seek "6970" inside of "abcdefg69hijklmn7opqrs0tuvw71xyz72", how to actually do this?

 

function seekCode(theSource)

	for index, player in ipairs (getElementsByType("player")) do

		local theCodeString = "abcdefg69hijklmn7opqrs0tuvw71xyz72"

		if theCodeString then
			local theFoundCode = string.find(theCodeString, "%d")
			outputChatBox( "The code is: " .. theCodeString .. " - FOUND: " .. theFoundCode, theSource)
			else
			outputChatBox( "n/a", theSource)
		end
	end
end
setTimer(seekCode, 1500, 0)

 

[IIYAMA]

20 minutes ago, MTA.Castiel said:

how to actually do this?

You can for example replace all non numeric characters with empty strings.

string.gsub("abcdefg69hijklmn7opqrs0tuvw71xyz72", "[^%d]", "") 
--[[
  Returns 2 values:
    Result: 69707172
    Items replaced (with empty string): 26
]]

 

 

[MTA.Castiel]

Well i can for example use:

string.gsub("abcdefg69hijklmn7opqrs0tuvw71xyz72", "[^%d]", "")

But that returns all the digits inside the string resulting in a value of "69707172". I'm only having difficulty getting the first 4 of them which in this "randomly generated string" is suppose to be "6970". Still clueless as to how it should be done @ IIYAMA

[IIYAMA]

7 hours ago, MTA.Castiel said:

I'm only having difficulty getting the first 4 of them

string.sub(string.gsub("abcdefg69hijklmn7opqrs0tuvw71xyz72", "[^%d]", ""), 1, 4) -- 6970

With string.sub you can make a selection of characters.

Arguments:

1. The string
2. Start index: 1
3. End index: 4

https://www.tutorialspoint.com/string-sub-function-in-lua

[MTA.Castiel]

I see now, okay i got it  Thank you for the link to tutorialspoint as well.