php-doc-en/reference/pcre/configure.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<section xml:id="pcre.installation" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.install;
 <para>
  Beginning with PHP 4.2.0 these functions are enabled by default. You can
  disable the pcre functions with
  <option role="configure">--without-pcre-regex</option>. Use
  <option role="configure">--with-pcre-regex=DIR</option> to specify DIR
  where PCRE's include and library files are located, if not using bundled library.
  For older versions you have to configure and compile PHP 
  with <option role="configure">--with-pcre-regex[=DIR]</option> in order
  to use these functions.
 </para>
 &windows.builtin;
 <note>
  <para>
   As of PHP 5.3.0 this extension cannot be disabled and is therefore always
   present.
  </para>
  <para>
   It is still possible to build against an external PCRE library by using
   <option role="configure">--with-pcre-regex=DIR</option>
  </para>
 </note>
 <para>
  PCRE is an active project and as it changes so does the PHP
  functionality that relies upon it. It is possible that certain parts
  of the PHP documentation is outdated, in that it may not cover the
  newest features that PCRE provides. For a list of changes, see the
  <link xlink:href="&url.pcre.changelog;">PCRE library changelog</link>
  and also the following bundled PCRE history:
 </para>
 <para>
  <table>
   <title>Upgrade history of the bundled PCRE library</title>
   <tgroup cols="3">
    <thead>
     <row>
      <entry>PHP &Version;</entry>
      <entry>Updated PCRE &Version;</entry>
      <entry>Notes</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>4.4.7</entry>
      <entry>7.7</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.0.0</entry>
      <entry>4.5</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.0.5</entry>
      <entry>5.0</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.1.0</entry>
      <entry>6.2</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.0</entry>
      <entry>6.7</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.2</entry>
      <entry>7.0</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.4</entry>
      <entry>7.2</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.5</entry>
      <entry>7.3</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.6</entry>
      <entry>7.6</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.2.7</entry>
      <entry>7.8</entry>
      <entry></entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>7.9</entry>
      <entry></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </para>
</section>

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