Method GetBlockPattern

src/Squirrel/MarkdownSharp.cs:544–681

derived pretty much verbatim from PHP Markdown

()

        /// derived pretty much verbatim from PHP Markdown
        /// </summary>
        private static string GetBlockPattern()
        {

            // Hashify HTML blocks:
            // We only want to do this for block-level HTML tags, such as headers,
            // lists, and tables. That's because we still want to wrap <p>s around
            // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
            // phrase emphasis, and spans. The list of tags we're looking for is
            // hard-coded:
            //
            // *  List "a" is made of tags which can be both inline or block-level.
            //    These will be treated block-level when the start tag is alone on
            //    its line, otherwise they're not matched here and will be taken as
            //    inline later.
            // *  List "b" is made of tags which are always block-level;
            //
            string blockTagsA = "ins|del";
            string blockTagsB = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|script|noscript|form|fieldset|iframe|math";

            // Regular expression for the content of a block tag.
            string attr = @"
            (?>                    # optional tag attributes
              \s                  # starts with whitespace
              (?>
                [^>""/]+              # text outside quotes
              |
                /+(?!>)                # slash not followed by >
              |
                ""[^""]*""            # text inside double quotes (tolerate >)
              |
                '[^']*'                  # text inside single quotes (tolerate >)
              )*
            )?
            ";

            string content = RepeatString(@"
                (?>
                  [^<]+              # content without tag
                |
                  <\2              # nested opening tag
                    " + attr + @"       # attributes
                  (?>
                      />
                  |
                      >", _nestDepth) +   // end of opening tag
                      ".*?" +             // last level nested tag content
            RepeatString(@"
                      </\2\s*>          # closing nested tag
                  )
                  |      
                  <(?!/\2\s*>           # other tags with a different name
                  )
                )*", _nestDepth);

            string content2 = content.Replace(@"\2", @"\3");

            // First, look for nested blocks, e.g.:
            //   <div>