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<section id="pcre.constants">
 &reftitle.constants;
 &extension.constants;
 <table>
  <title>PREG constants</title>
  <tgroup cols="2">
   <thead>
    <row>
     <entry>constant</entry>
     <entry>description</entry>
    </row>
   </thead>
   <tbody>
    <row>
     <entry>PREG_PATTERN_ORDER</entry>
     <entry>
      Orders results so that $matches[0] is an array of full pattern
      matches, $matches[1] is an array of strings matched by the first
      parenthesized subpattern, and so on. This flag is only used with
      <function>preg_match_all</function>.
     </entry>
    </row>
    <row>
     <entry>PREG_SET_ORDER</entry>
     <entry>
      Orders results so that $matches[0] is an array of first set of
      matches, $matches[1] is an array of second set of matches, and so
      on. This flag is only used with <function>preg_match_all</function>.
     </entry>
    </row>
    <row>
     <entry>PREG_OFFSET_CAPTURE</entry>
     <entry>
      See the description of
      <constant>PREG_SPLIT_OFFSET_CAPTURE</constant>.  This flag is
      available since PHP 4.3.0.
     </entry>
    </row>
    <row>
     <entry>PREG_SPLIT_NO_EMPTY</entry>
     <entry>
      This flag tells <function>preg_split</function> to return only non-empty
      pieces.
     </entry>
    </row>
    <row>
     <entry>PREG_SPLIT_DELIM_CAPTURE</entry>
     <entry>
      This flag tells <function>preg_split</function> to capture
      parenthesized expression in the delimiter pattern as well. This flag
      is available since PHP 4.0.5.
     </entry>
    </row>
    <row>
     <entry>PREG_SPLIT_OFFSET_CAPTURE</entry>
     <entry>
      If this flag is set, for every occurring match the appendant string
      offset will also be returned. Note that this changes the return
      values in an array where every element is an array consisting of the
      matched string at offset 0 and its string offset within subject at
      offset 1. This flag is available since PHP 4.3.0
      and is only used for <function>preg_split</function>.
     </entry>
    </row>
    <row>
     <entry>PREG_NO_ERROR</entry>
     <entry>
      Returned by <function>preg_last_error</function> if there were no
      errors. Available since PHP 5.2.0.
     </entry>
    </row>
    <row>
     <entry>PREG_INTERNAL_ERROR</entry>
     <entry>
      Returned by <function>preg_last_error</function> if there was an
      internal PCRE error. Available since PHP 5.2.0.
     </entry>
    </row>
    <row>
     <entry>PREG_BACKTRACK_LIMIT_ERROR</entry>
     <entry>
      Returned by <function>preg_last_error</function> if <link
      linkend="ini.pcre.backtrack-limit">backtrack limit</link> was exhausted.
      Available since PHP 5.2.0.
     </entry>
    </row>
    <row>
     <entry>PREG_RECURSION_LIMIT_ERROR</entry>
     <entry>
      Returned by <function>preg_last_error</function> if <link
      linkend="ini.pcre.recursion-limit">recursion limit</link> was exhausted.
      Available since PHP 5.2.0.
     </entry>
    </row>
    <row>
     <entry>PREG_BAD_UTF8_ERROR</entry>
     <entry>
      Returned by <function>preg_last_error</function> if the last error was
      caused by malformed UTF-8 data (only when running a regex in <link
      linkend="reference.pcre.pattern.modifiers">UTF-8 mode</link>). Available
      since PHP 5.2.0.
     </entry>
    </row>
   </tbody>
  </tgroup>
 </table>
</section>

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