source: branches/rsr.v5.1.1/web/punbb/include/utf8/utils/patterns.php @ 6

<?php

/**
* PCRE Regular expressions for UTF-8. Note this file is not actually used by
* the rest of the library but these regular expressions can be useful to have
* available.
* @version $Id: patterns.php,v 1.1 2006/02/25 14:20:02 harryf Exp $
* @see http://www.w3.org/International/questions/qa-forms-utf-8
* @package utf8
* @subpackage patterns
*/

/**
* PCRE Pattern to check a UTF-8 string is valid
* Comes from W3 FAQ: Multilingual Forms
* Note: modified to include full ASCII range including control chars
* @see http://www.w3.org/International/questions/qa-forms-utf-8
* @package utf8
* @subpackage patterns
*/
$UTF8_VALID = '^('.
        '[\x00-\x7F]'.                          # ASCII (including control chars)
        '|[\xC2-\xDF][\x80-\xBF]'.              # Non-overlong 2-byte
        '|\xE0[\xA0-\xBF][\x80-\xBF]'.          # Excluding overlongs
        '|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'.   # Straight 3-byte
        '|\xED[\x80-\x9F][\x80-\xBF]'.          # Excluding surrogates
        '|\xF0[\x90-\xBF][\x80-\xBF]{2}'.       # Planes 1-3
        '|[\xF1-\xF3][\x80-\xBF]{3}'.           # Planes 4-15
        '|\xF4[\x80-\x8F][\x80-\xBF]{2}'.       # Plane 16
        ')*$';

/**
* PCRE Pattern to match single UTF-8 characters
* Comes from W3 FAQ: Multilingual Forms
* Note: modified to include full ASCII range including control chars
* @see http://www.w3.org/International/questions/qa-forms-utf-8
* @package utf8
* @subpackage patterns
*/
$UTF8_MATCH =
        '([\x00-\x7F])'.                          # ASCII (including control chars)
        '|([\xC2-\xDF][\x80-\xBF])'.              # Non-overlong 2-byte
        '|(\xE0[\xA0-\xBF][\x80-\xBF])'.          # Excluding overlongs
        '|([\xE1-\xEC\xEE\xEF][\x80-\xBF]{2})'.   # Straight 3-byte
        '|(\xED[\x80-\x9F][\x80-\xBF])'.          # Excluding surrogates
        '|(\xF0[\x90-\xBF][\x80-\xBF]{2})'.       # Planes 1-3
        '|([\xF1-\xF3][\x80-\xBF]{3})'.           # Planes 4-15
        '|(\xF4[\x80-\x8F][\x80-\xBF]{2})';       # Plane 16

/**
* PCRE Pattern to locate bad bytes in a UTF-8 string
* Comes from W3 FAQ: Multilingual Forms
* Note: modified to include full ASCII range including control chars
* @see http://www.w3.org/International/questions/qa-forms-utf-8
* @package utf8
* @subpackage patterns
*/
$UTF8_BAD =
        '([\x00-\x7F]'.                          # ASCII (including control chars)
        '|[\xC2-\xDF][\x80-\xBF]'.               # Non-overlong 2-byte
        '|\xE0[\xA0-\xBF][\x80-\xBF]'.           # Excluding overlongs
        '|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'.    # Straight 3-byte
        '|\xED[\x80-\x9F][\x80-\xBF]'.           # Excluding surrogates
        '|\xF0[\x90-\xBF][\x80-\xBF]{2}'.        # Planes 1-3
        '|[\xF1-\xF3][\x80-\xBF]{3}'.            # Planes 4-15
        '|\xF4[\x80-\x8F][\x80-\xBF]{2}'.        # Plane 16
        '|(.{1}))';                              # Invalid byte