textlualua-patterns

Lua matching wrong pattern


I need to match string and return (\aHEX) and (text).

And use it like

for k, v in string.gmatch("Default \aFFFFFFFFWhite text \aFF0000FFJust red text", "<pattern>") do
    -- k = "" / "\aFFFFFFFF" / "\aFF0000FF"
    -- v = "Default" / "White text " / "Just red text"
end

tried this

local text = "Default \aFF00FFFFRed text\a00FF00FFGreen";

for k, v in text:gmatch("(\a%x%x%x%x%x%x%x%x)(%w+)") do
    print(string.format("%s: %s", k, v));
    -- \aFF00FFFF: Red
    -- \a00FF00FF: Green
end

Missing "Default" and " text"


Solution

  • The problem is that you cannot make a sequence of patterns optional with Lua patterns.

    You can use

    local text = "Default \aFF00FFFFRed text\a00FF00FFGreen";
     
    for word in text:gmatch("\a?[^\a]+") do
      k, v = word:match("^(\a%x%x%x%x%x%x%x%x)(%w+)$")
      if k then
         print(string.format("%s: %s", k, v));
      else
         print(word)
      end
    end
    

    Output:

    Default 
    FF00FFFFRed text
    00FF00FF: Green
    

    Details:

    • \a?[^\a]+ matches all occurrences of sequences that start with an optional \a, and then contain one or more chars other than \a
    • then ^(\a%x%x%x%x%x%x%x%x)(%w+)$ is applied to each found substring, and if there is a match, the key:value pair is produced, else the whole match is the required value.