Menu
I have a XHTML form where I ask people to enter their full name. I then match that with preg_match() using this pattern: /^[\p{L}\s]+$/
On my local server running PHP 5.2.13 (PCRE 7.9 2009-04-11) this works fine. On the webhost running PHP 5.2.10 (PCRE 7.3 2007-08-28) it doesn't match when the entered string contains the Danish Latin character ø ( http://www.ltg.ed.ac.uk/~richard/utf-8.cgi?input=%F8&mode=char ).
Is this a bug? Is there a work around?
Thank you in advance!
217
asked Mar 24 '11 19:03
Definition and Usage The preg_match() function returns whether a match was found in a string.
preg_match() returns 1 if the pattern matches given subject , 0 if it does not, or false on failure. This function may return Boolean false , but may also return a non-Boolean value which evaluates to false .
The preg_match() function returns true if pattern matches otherwise, it returns false.
The strcmp() function compares two strings. Note: The strcmp() function is binary-safe and case-sensitive. Tip: This function is similar to the strncmp() function, with the difference that you can specify the number of characters from each string to be used in the comparison with strncmp().
So, the problem is as presumed. You are not using the /u modifier. This means that PCRE will not look for UTF-8 characters.
In any case, this is how it should be done:
var_dump(preg_match('/^[\p{L}\s]+$/u', "ø"));
And works on all my versions. There might be a bug in others, but that's not likely here.
Your problem is that this also works:
var_dump(preg_match('/^[\p{L}\s]+$/', utf8_decode("ø")));
Notice that this uses ISO-8859-1 instead of UTF-8, and leaves out the /u modifier. The result is int(1). Obviously PCRE interprets the Latin-1 ø as matching \p{L} when in non-/unicode mode. (Most of the single-byte \xA0-\xFF are letter symbols in Latin-1, and the 8-bit code point as the same as in Unicode, so that's actually ok.)
Conclusion: Your input is actually ISO-8859-1. That's why it accidentally worked for you without the /u. Change that, and be eaxact with input charsets.
72
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
