editing tsunami syntax: italics & bolding (325)

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tsunami syntax

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==Introduction
Time allows \_italics_ and \*bolding\*: _italics_ and *bolding*.  The trick is this: which underscores and which asterisks trigger markup?  This is not the easiest of questions.

=Was this
{{
html = Regex.Replace(html, @"
    (?<=              # the character before the _ must be:
        ^             # beginning of the string
        |             # or
        [ \t>(\r\n]   # space, tab, open paren, end of line
    )
    _                 # the underscore that gets removed
    (
        (?:           # one or more of:
            [^_<>]    # no underscores or other HTML markup (from previous replaces)
            |         # or
            \\\\_       # escaped underscores are allowed
        )+?
    )
    (?<!\\\\)           # don't match an underscore if it is escaped
    _                 # the ending underscore that gets removed
    ", 
    "<em>$1</em>", RegexOptions.IgnorePatternWhitespace);
}}

=Currently
{{
var map = new Dictionary<string, string>();

map["_"] = "em";
map["*"] = "strong";
map["--"] = "strike";

// emphasize, bold, strikethrough
html = Regex.Replace(html, @"
	(?<!\\\\)
	(?<=[ \\t>(\\r\\n\\-]|^)    #yuck... had to remove [a-z], as a_b_c should NOT italicize b
	(_|\\*|--)
	(?![ \\t\\r\\n`])
	(
		(?:
			(?!\\1)[^<>\\r\\n]
			|
			\\\\\\1
		)+?
	)
	(?<!\\\\)
	\\1", 
	m => string.Format("<{0}>{1}</{0}>", map[m.Groups[1].Value], m.Groups[2]),
	RegexOptions.IgnorePatternWhitespace);
}}

=Problem
{{
      \\_italics_ and \\*bolding*: _italics_ and *bolding*
bold:                          ^^^^^^^^^^^^^^^^
italic:                           
}}

(I'm not sure I want to have to escape all * and _ and --.)

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