Parsing remoteUser header value


I have Splunk 7 with SSO enabled. Is there any way to extract certain value remoteUser header? For example, I want to extract from header with content "CN=cnvalue,O=MYORG,C=US" the value of CN, so Splunk wiil use only "cnvalue" as remote user. I know this can be done by Apache, but is there any way to do it on Splunk's side?

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