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

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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 <literal>PHP</literal> 4.3.0 .
     </entry>
    </row>
    <row>
     <entry>PREG_SPLIT_NO_EMPTY</entry>
     <entry>
      This flag tells <function>preg_split</function> to only 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 <literal>PHP</literal> 4.0.5 .
     </entry>
    </row>
    <row>
     <entry>PREG_SPLIT_OFFSET_CAPTURE</entry>
     <entry>
      If this flag is set, for every occuring match the appendant string
      offset will also be returned. Note that this changes the return
      value in an array where very element is an array consisting of the
      matched string at offset 0 and it's string offset into subject at
      offset 1. This flag is available since <literal>PHP</literal> 4.3.0
      and is only used for <function>preg_split</function>.
     </entry>
    </row>
   </tbody>
  </tgroup>
 </table>
</section>

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