Add FAQ about adding slashes via regular expression.

FAQ.html

@@ -382,6 +382,20 @@ http://leonard.staff.imaginet.fr/Doc/php/configuration_NT.html</a>.
     while (list($var, $value) = each($HTTP_POST_VARS)) {
         echo "$var = $value&lt;br&gt;\n";
     }</PRE>
+  <P>
+  </DD>
+
+  <DT><B>
+    I need to convert all single-quotes (') to a backslash followed by
+    a single-quote. How can I do this with a regular expression?
+  </B></DT>
+  <DD>
+    First off, take a look at the <A href="manual/function.addslashes.php3">addslashes()</A> function. It will do
+    exactly what you want.
+  <P>
+    The ereg_replace magic you're looking for, however, is simply:<PRE>
+    $escaped = ereg_replace("'", "\\'", $input);</PRE>
+  <P>
   </DD>
 
   <DT><B>