How to know write check if I want to know ${firstname} are returned 20 times in bodyString, thanks.

I using contacts_advancesearch_level1.csv
firstname, lastname
tracy,zhao

.feed(csv(“contacts_advancesearch_level1.csv”))
.exec(http(“request_85”)
.post("""/contacts/json""")
.headers(headers_82)
.formParam(""“firstName”"", “”"""")
.formParam(""“lastName”"", “”"""")
.formParam(""“cacheSearching”"", “”“no”"")
.formParam("""_search""", “”“false”"")
.formParam(""“nd”"", “”“1416364862033"”")
.formParam(""“rows”"", “”“25"”")
.formParam(""“pageNo”"", “”“1"”")
.formParam(""“sidx”"", “”“lastName”"")
.formParam(""“sord”"", “”“asc”"")
.formParam(""“filterRules”"", “”"[{“id”:0,“fieldValue”:"${firstname}",“searchName”:“firstName”}]""")
.formParam(""“isSort”"", “”“false”""))

but I wonder to know ${firstname} is as formParam in last post request. but how to know “tracy” are returned 20 times in bodyString, thanks.

In fact 25 records are returned if I using first name "tracy’ to search, I want to check search filter is correct.

Use a check (regex or jsonPath) with a count.
http://gatling.io/docs/2.1.2/http/http_check.html