I have a Netscaler (10000) NS9.3: Build 52.3.cl There is a document contains a short tutorial about GeoIP database implementation at http://support.citrix.com/article/CTX130701 I have added location database by following this tutorial successfully but instead of dropping connections I need to replace a string in content body. To do that, I created a rewrite action with those parameters. * Name: ns_country_replacement_action * Type: REPLACE_ALL * Target Expression: HTTP.RES.BODY(50000) * Replacement Text: HTTP.RES.HEADER("international") * Pattern: \{\/\*COUNTRY_NAME\*\/\} To insert header called "international", I try to create another rewrite action with those parameters. I'll add this one's policy prior. * Name: ns_country_injection_action * Type: INSERT_HTTP_HEADER * Header Name: international * Header Value: CLIENT.IP.SRC.MATCHES_LOCATION("*.US.*.*.*.*").NOT When I click on create button, it says; Compound expression syntax error, [.*.*").NOT^, 50] I'm not sure but I think that two things might cause this error. The expression I use for MATCHES_LOCATION is wrong but I use same expression in the tutorial. MATCHES_LOCATION().NOT returns BOOLEAN but the field expects STRING. How can I get this work? Do I use right tools to accomplish what I need to do? Thank you. -Umut