Question With string patterns

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#1

Trying to work out how to apply a gsub rule which affects the input, and everything after it.,

Example:

Input >> LolMyNameXXisLuaBearyGood

With ‘XX’ being the input argument

For this to then output LolMyNameHiXXisLuaBearyGoodHi

1 Like
#2 
local MyOutput = nil
local text = "LolMyNameXXisLuaBearyGood"
local done = false

for i = 1,#text-1,1 do
    if done then return end
    if string.sub(text,i,i+1) == ("XX" or "Xx" or "xX" or "xx") then
        done = true
        MyOutput = string.sub(text,1,i-1).."Hi"..string.sub(text,i,#text).."Hi"
        print(output)
    end
end
#3

Thanks for the solution, and while im sure its valid im really specifically looking for a general gsub rule using string patterns, ive come close but finding a magic character / combination for ‘rest of string’ has stumped me.

#4

Can you put @kjetl15 reply as the solution? So we know it’s been solved.

#5

Please read my last response to this post, my issue specifically is yet to be solved.

#6

just do

local myString = "LolMyNameXXisLuaBearyGood"

local newString = myString:gsub("XX", "Hi")
#7

That will just replace the term ‘XX’ with ‘Hi’

#8 
local t = "LolMyNameXXisLuaBearyGood"; 
local add = "Hi";  
local input = "XX"
print(t:gsub("(.*)"..input.."(.*)","%1"..add..input.."%2"..add))
--Output-> LolMyNameHiXXisLuaBearyGoodHi
2 Likes
#9 
local text = "LolMyNameXXisLuaBearyGood"
local pattern = "XX"
local add = "Hi"

local newString = text:gsub(pattern , add..pattern)..add

output: “LolMyNameHiXXisLuaBearyGoodHi”
if the input doesn’t have XX in it it might still give an output with “Hi” at the end, I don’t have a current solution to that right now. As I wrote this theoretically.

#10

Keep in mind if XX is at the beginning or end of the string, this won’t work properly. Depending on the usecase, it may be safer to use (.*) there instead. (+ matches 1 or more characters greedily, while * matches 0 or more characters greedily)

4 Likes
#11

Ended up going with @kjelt15’s solution with an additional match check to make sure the pattern was present to avoid the pointless ‘hi’ at the end.

@addictedroblox1414’s solution does theoretically work but (.+) really screwed up more specific use cases and therefor only worked not he example string, depending on your use case his will work too.

1 Like
#12

Oof that’s right, an honest oversight. Thanks! Will make the appropriate edit.

1 Like
#13

I’m glad you have found your answer!
With @rogchamp edit, the pattern i commented should now be more useful in broader scenarios. Happy coding!

1 Like