Re: Check if PCRE has UTF-8 support compiled in

The first thing I would do is to convince those guys (RedHat) to compile 
PCRE with UTF-8 and Unicode stuff support (that's 2 different build 
options). They have probably forgot to include them.
Ok, so to detect if you have UTF-8 support.. uhm we could add a function to 
do that (PCRE exports that information), but I think you want something 
quicker than asking everybody to upgrade php :P You can always try to match 
a simple thing and see if it returns an error or not.
e.g. if (!preg_match('/\pL/u', 'a')) die('bastard');

Nuno


----- Original Message ----- 
From: "Andries Seutens" <[email protected]>
To: <[email protected]>
Sent: Wednesday, June 27, 2007 6:36 PM
Subject: [PHP-I18N] Check if PCRE has UTF-8 support compiled in


> Dear all,
>
> In the Zend Framework we have written a filter to filter anything but 
> alpha an numeric characters from a string. The regular expression for this 
> filter looks like so:
>
> $result = preg_replace('/[^\p{L}\p{N}\s]/u', '', '!!testing123!!');
>
> Apperently, on some systems like RHEL however, this regular expression 
> seems to fail.  The reason that it is failing for you appears to be that 
> your PCRE does not have UTF-8 support compiled in?  This is likely the 
> result of the particular distribution not having used the --enable-utf8 
> option.
>
> What this means to us is that the class should become aware of whether 
> such support is available, and act accordingly.
>
> My question to you guys is, how would such a check for support best be 
> done? Perhaps detect the error condition, which would only occur in the 
> event that the system does not have utf-8 support? But how (preferably 
> without going down the dirty path .... )?
>
> Best regards,
>
>
> Andries Seutens
> http://andries.systray.be
> -- 
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