php-doc-en/reference/regex/functions/sql-regcase.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.sql-regcase">
   <refnamediv>
    <refname>sql_regcase</refname>
    <refpurpose>
     Make regular expression for case insensitive match
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>sql_regcase</methodname>
      <methodparam><type>string</type><parameter>string</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns a valid regular expression which will match
     <parameter>string</parameter>, ignoring case. This expression is
     <parameter>string</parameter> with each character converted to a
     bracket expression; this bracket expression contains that
     character's uppercase and lowercase form if applicable, otherwise
     it contains the original character twice.
     <example>
      <title><function>sql_regcase</function> Example</title>
      <programlisting role="php">
<![CDATA[
echo sql_regcase ("Foo bar");
]]>
      </programlisting>
     </example>
     prints <screen>[Ff][Oo][Oo] [Bb][Aa][Rr]</screen>.
    </para>
    <para>
     This can be used to achieve case insensitive pattern matching in
     products which support only case sensitive regular expressions.
    </para>
   </refsect1>
  </refentry>

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