g it on the
command line is the same as not having a syntax at all.
</p>
</dd>
<dt><code>header &quot;<var>regex</var>&quot; &hellip;</code></dt>
<dd><p>If from all defined syntaxes no <var>fileregex</var> matched, then compare
this <var>regex</var> (or regexes) against the first line of the current file,
to determine whether this syntax should be used for it.
</p>
</dd>
<dt><code>magic &quot;<var>regex</var>&quot; &hellip;</code></dt>
<dd><p>If no <var>fileregex</var> matched and no <code>header</code> reg