plasticboy/vim-markdown — comment on commit fd3418394f486198db31b5a07596e6fd2bf09479
File:  line 0
By Xeoncross:

Did you know you can add an extra + sign after the last `\n` in order to cache empty lines between blocks?

/^\s*\n\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\+\)\+/