Unicode escape sequences in PHP?

Hi all, I have a question regarding unicode character escape sequences:

I need to match char 0x2022 (bullet).

PHP's \x does not support multibyte chars.
PCRE (e.g. preg_match) supports \u2022, but only on platforms where the 
PCRE lib has been compiled with a certain flag.

Is there an escape sequence I can use with mb_ereg that will match this 
character?

Thanks,
Frank

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