问题
I\'m trying to write a reasonably permissive validator for names in PHP, and my first attempt consists of the following pattern:
// unicode letters, apostrophe, hyphen, space
$namePattern = \"/^([\\\\p{L}\'\\\\- ])+$/\";
This is eventually passed to a call to preg_match(). As far as I can tell, this works with your vanilla ASCII alphabet, but seems to trip up on spicier characters like Ă or 张.
Is there something wrong with the pattern itself? Perhaps I\'m expecting \\p{L} to do more work than I think it does?
Or does it have something to do with the way input is being passed in? I\'m not sure if it\'s relevant, but I did make sure to specify a UTF8 encoding on the form page.
回答1:
I think the problem is much simpler than that: You forgot to specify the u modifier. The Unicode character properties are only available in UTF-8 mode.
Your regex should be:
// unicode letters, apostrophe, hyphen, space
$namePattern = '/^[-\' \p{L}]+$/u';
回答2:
If you want to replace Unicode old pattern with new pattern you should write:
$text = preg_replace('/\bold pattern\b/u', 'new pattern', $text);
So the key here is u modifier
Note : Your server php version shoud be at least PHP 4.3.5
as mentioned here php.net | Pattern Modifiers
u (PCRE_UTF8) This modifier turns on additional functionality of PCRE that is incompatible with Perl. Pattern strings are treated as UTF-8. This modifier is available from PHP 4.1.0 or greater on Unix and from PHP 4.2.3 on win32. UTF-8 validity of the pattern is checked since PHP 4.3.5.
Thanks AgreeOrNot who give me that key here preg_replace match whole word in arabic
I tried it and it worked in localhost but when I try it in remote server it didn't work, then I found that php.net start use u modifier in PHP 4.3.5. , I upgrade php version and it works
Its important to know that this method is very helpful for Arabic users (عربي) because - as I believe - unicode is the best encode for arabic language, and replacement will not work if you don't use the u modifier, see next example it should work with you
$text = preg_replace('/\bمرحبا بك\b/u', 'NEW', $text);
回答3:
First of all, your life would be a lot easier if you'd use single apostrophes instead of double quotes when writing these -- you need only one backslash. Second, combining marks \pM should also be included. If you find a character not matched please find out its Unicode code point and then you can use http://www.fileformat.info/info/unicode/ to figure out where it is. I found http://hsivonen.iki.fi/php-utf8/ an invaluable tool when doing debugging with UTF-8 properties (don't forget to convert to hex before trying to look up: array_map('dechex', utf8ToUnicode($text))).
For example, Ă turns out to be http://www.fileformat.info/info/unicode/char/0102/index.htm and to be in Lu and so L should match it and it does match for me. The other character is http://www.fileformat.info/info/unicode/char/5f20/index.htm and is also isLetter and indeed matches for me. Do you have the Unicode character tables compiled in?
来源：https://stackoverflow.com/questions/4983392/matching-unicode-letter-characters-in-pcre-php