@Matt Clarke: thanks for the solution and it works specifically to the example of field_1, field_2. Actually my intention is, I have couple of fields as part of flow file which are separated by character &. My requirement is I would like to extract the specific field based on field name. I have been trying to achieve that experimenting regular expressions but could not able to succeed so far. Infact I ma trying to understand the regular expressions you specified but could not get hold of it. can you please let me know how to extract the fields in the flow file whose content is say firstname=testfirstname&lastname=testlastname,email=testemail@email.com,address=test address. I want to extract attributes firstname, lastname, email, address with appropriate values.
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