If statement not working, even though it should

[Dercen]

    if (string.match(file.Read(filename, path), checker) != nil) then
        for i,v in pairs( filet ) do
        print(v)
        print(checker)
            if (string.match(v, checker) != nil) then
                filet[i] = string.Replace(v, checker, checker .. adder .. "," )
                file.Write(filename, "Hi")
            end
        end
    else
The if statement on the top line works perfectly, putting me into the for loop. The table filet is my file, but split line by line into a table. Print(v) outputs "STEAM_0:0:0 Citizen private", and Print(checker) outputs "STEAM_0:0:0 Citizen ". So obviously, the beginning parts of the strings match. But, the If statement below the 2 print commands doesn't run.