php-doc-en/reference/mbstring/functions/mb-regex-encoding.xml

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  <refentry id="function.mb-regex-encoding">
   <refnamediv>
    <refname>mb_regex_encoding</refname>
    <refpurpose>
     Returns current encoding for multibyte regex as string
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>string</type><methodname>mb_regex_encoding</methodname>
     <methodparam choice="opt">
      <type>string</type><parameter>encoding</parameter>
     </methodparam>
    </methodsynopsis>
    <simpara>
     <function>mb_regex_encoding</function> returns the character
     encoding used by multibyte regex functions.
    </simpara>
    <para>
     If the optional parameter <parameter>encoding</parameter> is
     specified, it is set to the character encoding for multibyte
     regex. The default value is the internal character encoding.
    </para>
    <para>
     See also: <function>mb_internal_encoding</function>,
     <function>mb_ereg</function>
    </para>
   </refsect1>
  </refentry>

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