As Ravi Ranjan suggested you can use text checks.... you can use LR functions like web_reg_find ( if placing before the request) and web_find( if placing after the request ) and save the text count to a variable and PASS or FAIL a transaction based on the text count....
You can use this function for text count: web_reg_find("text=google","savecount=cnt",LAST); lr_start_transaction("google__T001_homepage"); if(atoi(lr_eval_string("{cnt}"))>0 { lr_end_transaction("google__T001_homepage",LR_PASS); } else { lr_end_transaction("google_homepage",LR_FAIL); lr_exit(LR_EXIT_ITERATION_AND_CONTINUE,LR_FAIL); // this stmt makes the users to continue even if transaction fails lr_exit(LR_EXIT_VUSER); to exit the Vuser }