nr-regexp-filter
A node that filters messages using the given property name and regular expression. The property name is deep-searched, so you can use something like "payload.my.prop" to test over "prop".
When the regexp matches the whole message will be returned, otherwise the whole message will be dropped.
Example: .(json|xml)$ matches everything that ends with .json and .xml
install
Go to /.node-red and launch
npm install nr-regexp-filter
It will creates a node_modules folder with the needed package. Restart the server to load the new palette.