don't run the image/anchor regexes in singleline-mode. That 1) seems …

…pointless, and 2) is inconsistent with PageDown: http://meta.stackexchange.com/q/251000

MarkdownSharp/Markdown.cs

@@ -800,7 +800,7 @@ [ ]? # one optional space
  \[
  (.*?) # id = $3
  \]
- )", GetNestedBracketsPattern()), RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
+ )", GetNestedBracketsPattern()), RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
 
  private static Regex _anchorInline = new Regex(string.Format(@"
  ( # wrap whole match in $1
@@ -819,14 +819,14 @@ [ ]*
  )? # title is optional
  \)
  )", GetNestedBracketsPattern(), GetNestedParensPattern()),
- RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
+ RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
 
  private static Regex _anchorRefShortcut = new Regex(@"
  ( # wrap whole match in $1
  \[
  ([^\[\]]+) # link text = $2; can't contain [ or ]
  \]
- )", RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
+ )", RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
 
  /// <summary>
  /// Turn Markdown link shortcuts into HTML anchor tags
@@ -964,7 +964,7 @@ [ ]? # one optional space
  (.*?) # id = $3
  \]
 
- )", RegexOptions.IgnorePatternWhitespace | RegexOptions.Singleline | RegexOptions.Compiled);
+ )", RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
 
  private static Regex _imagesInline = new Regex(String.Format(@"
  ( # wrap whole match in $1
@@ -984,7 +984,7 @@ [ ]*
  )? # title is optional
  \)
  )", GetNestedParensPattern()),
- RegexOptions.IgnorePatternWhitespace | RegexOptions.Singleline | RegexOptions.Compiled);
+ RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled);
 
  /// <summary>
  /// Turn Markdown image shortcuts into HTML img tags.