https://community.cloudera.com/t5/Support-Questions/ReplaceText-Processor-edit-only-the-header-of-csv-file/m-p/227271#M189131 <P>Please take a look at the following HCC thread:<BR /><A href="https://community.hortonworks.com/questions/35203/hi-where-can-i-find-the-rules-of-nifis-regex-langu.html" target="_blank">https://community.hortonworks.com/questions/35203/hi-where-can-i-find-the-rules-of-nifis-regex-langu.html</A></P><P>That thread also links to this website, which you can use to create your expressions and directly copy them to NiFi. You may not be using the correct syntax if it isn't working, so please verify with this website:</P><P><A href="https://regexr.com/" target="_blank">https://regexr.com/</A></P> Tue, 26 Jun 2018 19:52:44 GMT anarasimham 2018-06-26T19:52:44Z