sometimes i dream about parsing markdown according to guidelines

document.rb

@@ -200,7 +200,7 @@ module RBMark
 
     # Inline preformatted text
     class InlinePre < DOMObject
-      self.begin = /`(?!`)/
+      self.begin = /(?<!\\)`(?!`)/
       self.end = /`.+?`/
 
       # Stub parser for inline text element
@@ -250,7 +250,7 @@ module RBMark
 
     # Bold text
     class InlineBold < InlineFormattable
-      self.begin = /\*\*(?!\*\*)/
+      self.begin = /(?<!\\)\*\*(?!\*\*)/
       self.end = /\*\*.+?\*\*/
 
       # (see ::RBMark::DOM::DOMObject.parse)
@@ -261,7 +261,7 @@ module RBMark
 
     # Italics text
     class InlineItalics < InlineFormattable
-      self.begin = /\*(?!\*)/
+      self.begin = /(?<!\\)\*(?!\*)/
       self.end = /\*.+?\*/
 
       # (see ::RBMark::DOM::DOMObject.parse)
@@ -270,9 +270,21 @@ module RBMark
       end
     end
 
+    # Inline italics text (alternative)
+    class InlineAltItalics < InlineFormattable
+      self.begin = /(?<!\\)_(?!_)/
+      self.end = /_.+?_/
+      self.alt_for = ::RBMark::DOM::InlineItalics
+
+      # (see ::RBMark::DOM::DOMObject.parse)
+      def self.parse(text)
+        super(text[1..-2])
+      end
+    end
+
     # Underline text
     class InlineUnder < InlineFormattable
-      self.begin = /__(?!__)/
+      self.begin = /(?<!\\)__(?!__)/
       self.end = /__.+?__/
 
       # (see ::RBMark::DOM::DOMObject.parse)
@@ -283,7 +295,7 @@ module RBMark
 
     # Strikethrough text
     class InlineStrike < InlineFormattable
-      self.begin = /~~(?!~~)/
+      self.begin = /(?<!\\)~~(?!~~)/
       self.end = /~~.+?~~/
 
       # (see ::RBMark::DOM::DOMObject.parse)
@@ -294,7 +306,7 @@ module RBMark
 
     # Hyperreferenced text
     class InlineLink < InlineFormattable
-      self.begin = /(?<!!)\[[^\]]+?\]\([^)]+?\)/
+      self.begin = /(?<![!\\])\[[^\]]+?\]\([^)]+?\)/
       self.end = self.begin
 
       # (see ::RBMark::DOM::DOMObject.parse)
@@ -308,7 +320,7 @@ module RBMark
 
     # Image
     class InlineImage < InlinePre
-      self.begin = /!\[[^\]]+?\]\([^)]+?\)/
+      self.begin = /(?<!\\)!\[[^\]]+?\]\([^)]+?\)/
       self.end = self.begin
 
       # (see ::RBMark::DOM::DOMObject.parse)

mdpp.rb

@@ -280,6 +280,9 @@ module MDPP
     },
     "RBMark::DOM::HorizontalRule" => {
       "extra_newlines" => true
+    },
+    "RBMark::DOM::IndentBlock" => {
+      "indent" => true
     }
   }.freeze