Added note about version availability.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@17268 c90b9560-bf6c-de11-be94-00142212c4b1

functions/pcre.xml

@@ -9,12 +9,14 @@
     forward slash (/),  for example.  Any character can be used for
     delimiter as long as it's not alphanumeric or backslash (\). If
     the delimiter character has to be used in the expression itself,
-    it needs to be escaped by backslash.</para>
+    it needs to be escaped by backslash.
+   </para>
 
    <para>
     The ending delimiter may be followed by various modifiers that
     affect the matching. 
-    See <link linkend="pcre.pattern.modifiers">Pattern Modifiers</link>.</para>
+    See <link linkend="pcre.pattern.modifiers">Pattern Modifiers</link>.
+   </para>
 
    <para>
     <example>
@@ -24,7 +26,8 @@
       <listitem><simpara>|(\d{3})-\d+|Sm</simpara></listitem>
       <listitem><simpara>/^(?i)php[34]/</simpara></listitem>
      </itemizedlist>
-    </example></para>
+    </example>
+   </para>
    
    <para>
     <example>
@@ -35,7 +38,16 @@
       <listitem><simpara>1-\d3-\d3-\d4| - missing starting delimiter</simpara>
       </listitem>
      </itemizedlist>
-    </example></para>
+    </example>
+   </para>
+
+   <note>
+    <simpara>
+     The Perl-compatible regular expression functions are available in
+     PHP 4 and in PHP 3.0.9 and up.
+    </simpara>
+   </note>
+
   </partintro>
   
   <refentry id="function.preg-match">