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<h1>Backslash-escapes: basics</h1>
<p>**don't shout**</p>
<p>*don't emphasize*</p>
<p>_literal underscores_</p>
<p>__more literal underscores__</p>
<h2>This header has trailing hash marks ##</h2>
<h1>Backslash-escapes: links</h1>
<p>This is not a [link](/url/).</p>
<p>This is a link, not an image link: !<a href="/url/">link</a>.</p>
<p>Should this be an <a href="http://autolink\">http://autolink\</a> or not?
I'll ask on markdown-discuss.
I suspect PHP markdown is considering this NOT an autolink.</p>
<p>This is not a [link definition][link1] but <a href="/url/">this is</a>.</p>
<h1>Backslash-escapse: code blocks</h1>
<p>In a code block:</p>
<pre><code>escapes should \*not\* be \_interpreted\_
even \`backticks\`
</code></pre>
<h1>Backslash-escapse: code spans</h1>
<p>Getting backticks and backslash-escapes working correctly with
code spans can be tricky:</p>
<p><code>a normal code span</code></p>
<p><code>need multiple backticks to include a literal ` backtick</code></p>
<p><code>`use a leading space to start a code span with a backtick</code></p>
<p><code>use a trailing space to end a code span with a backtick`</code></p>
<p><code>backslash-escapes \(are\) \*not\* \`interpreted\` in a code span</code></p>
<p>`<code>a code span prefixed with a literal backtick</code></p>
<p>`not a code span`</p>
<p><em>Note A</em>: The <code>(?!`)</code> after the <code>\1</code> group in the
<code>_DoCodeSpans()/_do_code_spans()</code> regex is necessary to ensure that a backtick
doesn't match at the start of the code block (group <code>\2</code>) in an example like
this:</p>
<ul>
<li>`<code>foo</code></li>
</ul>
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