text = substr(block, 1, st - 1); block = substr(block, st + len);
if (match(text, /\n[[:space:]]*\n/)) return 0;
+ if (match(text, "(^|\n) ? ? ?" exclude "[ \t][^\n]+")) return 0;
if (match( list, "\n" exclude "[ \t]" )) {
block = substr(list, RSTART + 1) block;
list = substr(list, 1, RSTART);