Return an string where all or the first occurrence(s) of the given string, is replaced with something else

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#1

What I want to achieve is make an function which returns an copy of the given string, where the first or all occurrence(s) of other string, are replaced with other string/value.

Yes - string.gsub does exist, but it uses string patterns, which is not what I want. And so, what I want to achieve is basically string.gsub but without using string patterns.

My current code is the following:

local function GSub2(String, StrMatch)
	local function LoopString(Str, MatchStr)
		local CurrIdx = 0

		local function Iterator()
			CurrIdx += 1
			local Start, End = Str:find(MatchStr, CurrIdx, true)

			if Start and End then
				return Start and End
			end
		end

		return Iterator
	end
	
	for Start, End in LoopString(String, StrMatch) do
		local Str = String:sub(Start, End)
		
		
	end
end

Although, my main issue is discovering how I’ll return a copy of the given string without the match? Basically, how I’ll remove it from it?

Edit: I’ll also have to fix this code a bit.

#2

You don’t have to use string patterns.

print(string.gsub("Hello", "a", "e")) -- Hallo 1

That won’t do what you expect, return Start, End so you return both.

#3

Yes, it doesn’t need to, but if it does match an magic character or an character class, it’ll achieve a result I don’t want.

Also, thank you for pointing that out. That was also the error which needed a ‘fix’.

#4

You can escape magic characters by prepending a % sign before it

#5

Let me elaborate, since I did not before:

The real reason behind this all, is to make some sort of converter which adds the % sign before all magic characters found. Or an copy of string.gsub, which does the same but without using string patterns.

Now, back to the topic, how would I do what’s asked in the post?