Stop Grabbing Text Based On A Known Keyword

[HelloLudger]

Hey,

I really love Peggy, but I can't get one thing to work. Imagine the following input:

## First
Hello World
Another Line

## Second
This text should be part of the second
variable, named s.

I want to create a grammar to get the content following the titles "## First" and "## Second". The result look something like this:

{
   "first": "Hello World
Another Line",
   "second": "This text should be part of the second
variable, named s."
}

The titles are fixed, always "## First" and "## Second", followed by a line break. We can assume for now, that they always exist.
I created the following grammar:

Block
  = f:First s:Second? br* { return {first: f, second: s} }

First
  = "## First" br l:Lines             { return l }
  
Second
  = "## Second" br l:Lines            { return l }

Lines
  = ls:Line*                           { return ls.join("\n").trim() }
  
Line
  = br                                 { return "" }
  / text:charw+ br?                    { return text.join("").trim() }

br "new line"
  = [\n\r]
  
charw "character with whitespace"
  = [^\n\r]

I made s:Second optional, because the output shows clearly the problem:

{
   "first": "Hello World
Another Line

## Second
This text should be part of the second
variable, named s.",
   "second": null
}

If it's not optional, the error is: Line 7, column 19: Expected "## Second", character with whitespace, or new line but end of input found.

I can't find a solution, even though I assume the problem is pretty common.

Thank you in advance,
Ludger

[Mingun]

Your Lines rule consumes all input which you have. You should add a negative assertion to stop that. You need to check stop condition on each symbol, so:

charw "character with whitespace"
  = !Second @[^\n\r]