[Users] Faster to do avp_printf();avp_check OR search()?

[Kanakatti M. Subramanya]

e.g., if I want to do something if there is a Refer-To header in the 
message,
am I better off doing
avp_printf("$someAvp", "$rt");
avp_check("$rt", "re/.../i");

or

search("/.../");
Just want ot know whether to get started rewriting all the "search()" 
strings i have in my ser.cfg....

cheers
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