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LDAP Search Filter Help

Hi all..

I need some info on LDAP Search Filter. I have read the RFC1558 (LDAP v2
search filter specification),  and noticed that there are several
filtertypes

     <filtertype> ::= <equal> | <approx> | <greater> | <less>
     <equal> ::= '='
     <greater> ::= '>='
     <less> ::= '<='
     <present> ::= <attr> '=*'
     <approx> ::= '~='

Now, for <approx>, is there any documentation somewhere about this? How
exactly the approx comparison is perform? I need some insight on this....
thanks.

Regards,
Rosdi.