php-doc-en/reference/regex/functions/eregi.xml

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  <refentry id="function.eregi">
   <refnamediv>
    <refname>eregi</refname>
    <refpurpose>Case insensitive regular expression match</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>int</type><methodname>eregi</methodname>
     <methodparam><type>string</type><parameter>pattern</parameter></methodparam>
     <methodparam><type>string</type><parameter>string</parameter></methodparam>
     <methodparam choice="opt"><type>array</type><parameter role="reference">regs</parameter></methodparam>
    </methodsynopsis>
    <para>
     This function is identical to <function>ereg</function> except
     that this ignores case distinction when matching alphabetic
     characters.
    </para>
    <para>
     <example>
      <title><function>eregi</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$string = 'XYZ';
if (eregi('z', $string)) {
    echo "'$string' contains a 'z' or 'Z'!";
}
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>ereg</function>, <function>ereg_replace</function>,
     <function>eregi_replace</function>, <function>stripos</function>, and
     <function>stristr</function>.
    </para>
   </refsect1>
  </refentry>
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