sql_regcase
(PHP 4, PHP 5)
sql_regcase — Make regular expression for case insensitive match
Description
$string
)Creates a regular expression for a case insensitive match.
This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged.
Parameters
-
string -
The input string.
Return Values
Returns a valid regular expression which will match
string, ignoring case. This expression is
string with each alphabetic character converted to
a bracket expression; this bracket expression contains that character's
uppercase and lowercase form. Other characters remain unchanged.
Examples
Example #1 sql_regcase() example
<?php
echo sql_regcase("Foo - bar.");
?>
The above example will output:
[Ff][Oo][Oo] - [Bb][Aa][Rr].
This can be used to achieve case insensitive pattern matching in products which support only case sensitive regular expressions.
Notes
Note:
As of PHP 5.3.0, the regex extension is deprecated in favor of the PCRE extension. Calling this function will issue an
E_DEPRECATEDnotice. See the list of differences for help on converting to PCRE.
Коментарии
if you set right locale:
setlocale(LC_CTYPE,"ru_RU.KOI8-R");
print sql_regcase("Цffnung");
will output:
"[Цц][Ff][Ff][Nn][Uu][Nn][Gg]"
This function naivley replaces the letters in your expression.if your expression uses [] already using this will probably break it
function php7_regcase($str)
{
if (empty($str))
return '';
$chars = str_split($str);
foreach ($chars as $char) {
if (preg_match("/[A-Za-z]/", $char)) {
$str_upper = mb_strtoupper($char, 'UTF-8');
$str_lower = mb_strtolower($char, 'UTF-8');
$resp[] = "[{$str_upper}{$str_lower}]";
} else {
$resp[] = $char;
}
}
return implode('', $resp);
}