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-<head>
-<title>UK TeX FAQ -- question label matchbrak</title>
-</head><body>
-<h3>My brackets don&rsquo;t match</h3>
-<p/>(La)TeX has a low-level mechanism for matching braces in document
-text. This means you can type something like:
-<blockquote>
-<pre>
-\section{All \emph{OK} now.}
-</pre>
-</blockquote><p>
-and know that the first brace (for the argument of <code>\</code><code>section</code>) will
-be matched with the last brace, and the internal pair of braces (for
-the argument of <code>\</code><code>emph</code>) will be matched with each other. It&rsquo;s all
-very simple.
-<p/>However, LaTeX has a convention of enclosing optional arguments in
-brackets, as in:
-<blockquote>
-<pre>
-\section[OK]{All \emph{OK} now.}
-</pre>
-</blockquote><p>
-These brackets are not matched by TeX mechanisms, despite the
-superficial similarity of their use. As a result,
-straightforward-looking usages like:
-<blockquote>
-<pre>
-\section[All [OK] now]{All \emph{OK} now.}
-</pre>
-</blockquote><p>
-aren&rsquo;t OK at all &mdash; the optional argument comes to consist of
-&ldquo;All [OK&rdquo;, and <code>\</code><code>section</code> takes the single character &ldquo;n&rdquo; (of
-the first &ldquo;now&rdquo;) as its argument.
-<p/>Fortunately, TeX&rsquo;s scanning mechanisms helps us by accepting the
-syntax &ldquo;<code>{]}</code>&rdquo; to &lsquo;hide&rsquo; the closing bracket from the
-scanning mechanism that LaTeX uses. In practice, the commonest way
-to use this facility is:
-<blockquote>
-<pre>
-\section[All {[OK]} now]{All \emph{OK} now.}
-</pre>
-</blockquote><p>
-since bracing the bracket on its own &ldquo;looks odd&rdquo;.
-<p/>LaTeX has another argument syntax, even less regular, where the
-argument is enclosed in parentheses, as in:
-<blockquote>
-<pre>
-\put(1,2){foo}
-</pre>
-</blockquote><p>
-(a picture environment command).
-<p/>This mechanism is also prone to problems with matching closing
-parentheses, but the issue seldom arises since such arguments rarely
-contain text. If it were to arise, the same solution (enclosing the
-confused characters in braces) would solve the problem.
-<p/><p/><p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=matchbrak">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=matchbrak</a>
-</body>