Added TX:LAST_MATCHED_VAR_NAME. See #123.

doc/modsecurity2-apache-reference.xml

@@ -3,7 +3,7 @@
   <title>ModSecurity Reference Manual</title>
 
   <articleinfo>
-    <releaseinfo>Version 2.5.0-dev3 / (September 28, 2007)</releaseinfo>
+    <releaseinfo>Version 2.5.0-dev3 / (October 1, 2007)</releaseinfo>
 
     <copyright>
       <year>2004-2007</year>
@@ -2977,6 +2977,30 @@ SecAction setsid:%{REQUEST_COOKIES.PHPSESSID}</programlisting>
       this this request and then it will decided whether or not to allow/deny
       the request through.</para>
 
+      <para>The following is a list of reserved names in the TX
+      collection:</para>
+
+      <itemizedlist>
+        <listitem>
+          <para><literal moreinfo="none">TX:0</literal> - The matching value
+          when using the <literal moreinfo="none">@rx</literal> or <literal
+          moreinfo="none">@pm</literal> operator with the <literal
+          moreinfo="none">capture</literal> action.</para>
+        </listitem>
+
+        <listitem>
+          <para><literal moreinfo="none">TX:1-TX:9</literal> - The captured
+          subexpression value when using the <literal
+          moreinfo="none">@rx</literal> operator with capturing parens and the
+          <literal moreinfo="none">capture</literal> action.</para>
+        </listitem>
+
+        <listitem>
+          <para><literal moreinfo="none">TX:LAST_MATCHED_VAR_NAME</literal> -
+          The full name of the variable that was matched against.</para>
+        </listitem>
+      </itemizedlist>
+
       <programlisting format="linespecific">SecRule WEBSERVER_ERROR_LOG "does not exist" "phase:5,pass,<emphasis
           role="bold">setvar:tx.score=+5</emphasis>"
 SecRule<emphasis role="bold"> TX:SCORE</emphasis> "@gt 20" deny,log</programlisting>
@@ -5028,4 +5052,4 @@ SecRule REQUEST_METHOD "!<emphasis role="bold">@within %{tx.allowed_methods}</em
       </section>
     </section>
   </section>
-</article>
+</article>