Find start of next blank line (line with only whitespace or empty)

Check if string contains unescaped [ or ]

* Validate a table delimiter row without regex (avoids ReDoS from nested * quantifiers). Accepts: |? WS? :?-+:? WS? (| WS? :?-+:? WS?)* |? WS? * Sin

Check if a character (code or string) is Unicode/ASCII punctuation

Check if a character code is Unicode whitespace

Parse table row cells

Scan autolink <url> or <email>

Scan fenced code block

Scan HTML block

Scan link [text](url) or  or [text][ref] or [text]

Scan list (ordered or unordered)

Scan GFM table