Lua string match function

StrMatch.lua

-- Program: Lua String Match Func
-- Purpose: To help in tokenizers and stuff. This is a pretty tiny function that allows you to match for custom strings (of course it also has perfect escape-character support.)
-- Returns number start_pos, number end_pos, string match
-- Vurv Update 0.2.0 12/25/2020

-- Make sure quote and escape don't interfere with lua patterns.
local function match_str(self,quote,escape,pos)
    local matched = false
    local exp = string.format( "^[%s](.-)([%s]-)%s",quote,escape,quote )
    local matches = {}
    local first_quote
    repeat
	local start,endpos,str,escapes = self:find(exp,pos)
	pos = endpos
	if not first_quote then first_quote = start end
        if escapes then
            local len = #escapes
            str = str .. escapes:sub(1,len/2)
            if len%2 == 0 then
                -- Unescaped end of quote.
                matched = true
            else
                str = str .. quote
            end
        else
            -- No escape characters found, this is the end of the string
            matched = true
        end
        matches[#matches+1] = str
    until matched
		-- number StartPos,number EndPos,string Match
    return first_quote,pos,table.concat(matches)
end

-- Examples of usage

print( match_str(([["hello world@@@" bruh@" gaming"]]),"\"","@") ) --> 1	31	hello world@@" bruh" gaming
print( match_str(("gwoah this is cool!!g hello g"),"g","!") ) --> 1	21	woah this is cool!
-- The second output doesn't catch hello g because it is escaped twice, making it a valid end of string.