Detect a pattern in incoming json content

[James McMahon]

Good afternoon. I have a requirement to search for and detect a pattern
"request":"false" is anywhere in the content of a flowfile. The content is
json that spans multiple lines. My reuest key and value would be on its own
line, embedded within a tag like this

"options":"{
        "abc":""12345"
        "request":"false",
         .
         .
         }"

Is there a standard processor that I could use to read my json and search
for these tokens?
Thanks veyr much.
Jim