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Bug #73573 Сase-insensitive search error
Submitted: 2016-11-21 10:32 UTC Modified: 2016-11-21 11:03 UTC
From: ruk at mgpu dot ru Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 7.0.13 OS: Windows Server 2012 R2
Private report: No CVE-ID: None
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From: ruk at mgpu dot ru
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 [2016-11-21 10:32 UTC] ruk at mgpu dot ru
Description:
------------
In line with the processing of the Cyrillic alphabet in the regular expression key /i (case-insensitive search) error occurs

Windows Server 2012 R2
IIS 8.5
PHP 7.0.9 x64

Test script:
---------------
<?php
	header('Content-Type: text/plain; charset=windows-1251');

	$RegularExpression = '/^[a-zа-я]+$/i';

	$TestStrArray = array('ABC', 'abc', 'АБВ', 'абв');

	foreach ($TestStrArray as $TestStr)
	{
		$Result = preg_match($RegularExpression, $TestStr);

		echo $TestStr;

		if ($Result === false)
		{
			echo ' - Error'."\r\n";
		}
		else
		{
			echo ' - '.($Result === 0 ? 'not found' : 'found')."\r\n";
		}
	} // foreach
?>

Expected result:
----------------
ABC - found
abc - found
АБВ - not found
абв - found

Actual result:
--------------
ABC - found
abc - found
АБВ - found
абв - found

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 [2016-11-21 11:03 UTC] requinix@php.net
-Status: Open +Status: Not a bug -Package: *Regular Expressions +Package: PCRE related
 [2016-11-21 11:03 UTC] requinix@php.net
(Expected and Actual are backwards)


To match non-ASCII characters you must use UTF-8 and the /u flag.

'/^[a-zа-я]+$/iu' - only if the file is in UTF-8 encoding
"/^[a-z\u{0430}-\u{044F}]+$/iu"

https://3v4l.org/t4h9t
 
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