clean up emstrong

src/rules.ts

@@ -178,15 +178,27 @@ const emStrongLDelim = edit(/^(?:\*+(?:((?!\*)[punct])|[^\s*]))|^_+(?:((?!_)[pun
   .replace(/punct/g, _punctuation)
   .getRegex();
 
-//                        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
-//                        | Skip orphan inside strong      | Consume to delim | (1) #***              | (2) a***#, a***                    | (3) #***a, ***a                  | (4) ***#                 | (5) #***#                         | (6) a***a
-let emStrongRDelimAst = /^[^_*]*?__[^_*]*?\*[^_*]*?(?=__)|[^*]+(?=[^*])|(?!\*)[punct](\*+)(?=[\s]|$)|[^punct\s](\*+)(?!\*)(?=[punct\s]|$)|(?!\*)[punct\s](\*+)(?=[^punct\s])|[\s](\*+)(?!\*)(?=[punct])|(?!\*)[punct](\*+)(?!\*)(?=[punct])|[^punct\s](\*+)(?=[^punct\s])/;
-let emStrongRDelimUnd = /^[^_*]*?\*\*[^_*]*?_[^_*]*?(?=\*\*)|[^_]+(?=[^_])|(?!_)[punct](_+)(?=[\s]|$)|[^punct\s](_+)(?!_)(?=[punct\s]|$)|(?!_)[punct\s](_+)(?=[^punct\s])|[\s](_+)(?!_)(?=[punct])|(?!_)[punct](_+)(?!_)(?=[punct])/; // ^- Not allowed for _
-emStrongRDelimAst = edit(emStrongRDelimAst, 'gu')
+const emStrongRDelimAst = edit(
+  '^[^_*]*?__[^_*]*?\\*[^_*]*?(?=__)' // Skip orphan inside strong
++ '|[^*]+(?=[^*])' // Consume to delim
++ '|(?!\\*)[punct](\\*+)(?=[\\s]|$)' // (1) #*** can only be a Right Delimiter
++ '|[^punct\\s](\\*+)(?!\\*)(?=[punct\\s]|$)' // (2) a***#, a*** can only be a Right Delimiter
++ '|(?!\\*)[punct\\s](\\*+)(?=[^punct\\s])' // (3) #***a, ***a can only be Left Delimiter
++ '|[\\s](\\*+)(?!\\*)(?=[punct])' // (4) ***# can only be Left Delimiter
++ '|(?!\\*)[punct](\\*+)(?!\\*)(?=[punct])' // (5) #***# can be either Left or Right Delimiter
++ '|[^punct\\s](\\*+)(?=[^punct\\s])', 'gu') // (6) a***a can be either Left or Right Delimiter
   .replace(/punct/g, _punctuation)
   .getRegex();
 
-emStrongRDelimUnd = edit(emStrongRDelimUnd, 'gu')
+// (6) Not allowed for _
+const emStrongRDelimUnd = edit(
+  '^[^_*]*?\\*\\*[^_*]*?_[^_*]*?(?=\\*\\*)' // Skip orphan inside strong
++ '|[^_]+(?=[^_])' // Consume to delim
++ '|(?!_)[punct](_+)(?=[\\s]|$)' // (1) #___ can only be a Right Delimiter
++ '|[^punct\\s](_+)(?!_)(?=[punct\\s]|$)' // (2) a___#, a___ can only be a Right Delimiter
++ '|(?!_)[punct\\s](_+)(?=[^punct\\s])' // (3) #___a, ___a can only be Left Delimiter
++ '|[\\s](_+)(?!_)(?=[punct])' // (4) ___# can only be Left Delimiter
++ '|(?!_)[punct](_+)(?!_)(?=[punct])', 'gu') // (5) #___# can be either Left or Right Delimiter
   .replace(/punct/g, _punctuation)
   .getRegex();