IRule to mask data in HTTP Response but for certian URLs

i used the below Irule to mask creidt card in response & it works

https://devcentral.f5.com/wiki/irul...ubber.ashx

the issue is that i need to exclude some URLs ( @ the request ) from masking its reposnses . the Irule masks @ the respnse , but what i need to do is realted to the reqiest , how to do that ?