python re findall function : i have a below json string 

    s = '''
    {"messages":[],
    
    "fileToTestMapForAllFiles":{"/pfe/usp/include/nat_util.h":[{"profile":"Component_toxicity_L2VPN_L2CKT_L3VPN_VPLS_VMX","occam":0,"releases":"15.1 and after","image":"junos-x86-64-*.vmdk","feature":"-","platform":"-","testSystem":"inception.juniper.net","enhancedIp":0,"id":0,"testId":"2","gating":"GATING","mandatory":""},
    {"profile":"Component_toxicity_ipv46_bfd_ae_ifstate_VMX","occam":0,"releases":"15.1 and after","image":"junos-x86-64-*.vmdk","feature":"-","platform":"-","testSystem":"inception.juniper.net","enhancedIp":0,"id":0,"testId":"8","gating":"NON_GATING","mandatory":""},
    {"profile":"Component_toxicity_GRES_NSR_VMX","occam":0,"releases":"15.1 and after","image":"junos-x86-64-*.vmdk","feature":"-","platform":"-","testSystem":"inception.juniper.net","enhancedIp":0,"id":0,"testId":"9","gating":"GATING","mandatory":""},
    {"profile":"Component_toxicity_mcast_VMX","occam":0,"releases":"15.1 and after","image":"junos-x86-64-*.vmdk","feature":"-","platform":"","testSystem":"inception.juniper.net","enhancedIp":0,"id":0,"testId":"10","gating":"GATING","mandatory":""},
    {"profile":"RPD_PC_Basic_Sanity_ST","occam":1,"releases":"15.1 and after","image":"junos-x86-64-*.vmdk,junos-x86-32-*.vmdk","feature":"rpd","platform":"vmx","testSystem":"inception.juniper.net","enhancedIp":0,"id":0,"testId":"129","gating":"GATING","mandatory":""},
    {"profile":"RPD_PC_MISC","occam":1,"releases":"15.1 and after","image":"-","feature":"BBE-SANITY","platform":"mx-neo","testSystem":"inception.juniper.net","enhancedIp":1,"id":0,"testId":"387","gating":"GATING","mandatory":"18.2DCB,15.1F6-S10,17.2X75-D90,15.1R7,16.1R7,17.3R3,17.4R2,18.1R1,"}]},
    "fileToTestMappingNotExist":[],"filesNotAdded":[],"validationFailedForTheseFiles":[],"filesToAdd":[],"invalidPathNames":[]}
    '''
i need to found this pattern RPD_PC_<[anyword]>, when i call below code

    print re.findall(r"RPD_PC_", s)
    ['RPD_PC_', 'RPD_PC_']

because string contain the below string

    ['RPD_PC_Basic_Sanity_ST'] ['RPD_PC_MISC']

i am new in regular expresion so i am tring to find the pattern which will only look for **RPD_PC_MISC** not for **RPD_PC_Basic_Sanity_ST**