问将文本分割成块(Javascript，regex)

EN

[[heading1, block1], [heading2, block2], ...]

const s = `*GW, A
This is my very first line. The asterics defines a new block, followed by the initials (2-3 chars), a comma, a (possible) space and a code that could be A, R, T, RS or RSS. Followed by that is an optional dot. Linebreak afterwards, where the text comes.

	*JP, R.
	New block here, as the line (kind of) starts with an asterics. Indentations with 4 spaces or a tab means that it is a second level thing only, that does not need to be stripped away necessarily.

	But as you can see, a block can be devided into several
    lines, 

    even with multiple lines.

	*GML, T.
	And so we continue...

    Let's just make sure that a line can start with an
    *asterics, without breaking the whole thing.
	*GW, RS
	Yet another block here.

		*GW, RSS.
		And a very final one.

        Spread over several lines.

*TA, RS.
First level all of a sudden again.
*PA, RSX
    Just a line to check whether RSX is a separate block.

`;
  
const splits = s.split(/\*([A-Z]{2,3}),\s?([AT]|RS{0,2})(\.?)\n/).slice(1);

const grouped = [];

for (let i = 0; i < splits.length; i += 4) {
  const group = splits.slice(i, i+3);
  group[3] = splits[i+3].trim().split(/\s*[\r\n]+\s*/g);
  grouped.push(group);
}

console.log(grouped);

^[ \t]*\*[A-Z]{2,3},\s*(?:[ART]|RSS?)\.?[\n\r](?:(?!^[ \t]*\*[A-Z]{2,3},\s*(?:[ART]|RSS?)\.?)[\s\S])+

^[ \t]*\*[A-Z]{2,3}           # start of the line, spaces or tabs and 2-3 UPPERCASE letters
,\s*(?:[ART]|RSS?)\.?[\n\r]   # comma, space (optional), code, dot and newline
(?:                           # non-capturing group

    (?!^[ \t]*\*[A-Z]{2,3},\s*(?:[ART]|RSS?)\.?)   
                              # neg. lookahead with the same pattern as above
    [\s\S]                    # \s + \S = effectively matching every character
)+