[Serusers] regular expression

[Richard]

Hi,

I am trying to use negative match in regular expression but without using
!uri=~. For example, any uri not starting with 9. I tried this,
    if (uri=~"^sip:(?!9).*@testdomain.com")

I got this error.
    ERROR: fix_expr : bad re "^sip:(?!9).*@testdomain.com"

Does ser support this kind of regular expression?

Thanks,
Richard