Count frequency of a keyword in social media content
Count the occurrences of a special (marketing) keyword in a text field.
In this use case both the content and the keyword for a social media post are stored in separate fields.
Configuration
Create a Custom smart number field and use the General parsing mode.
Expression
%{count(findPattern(%{issue.cfnnnn}, %{issue.cfmmmm}))}
Please, note that it is necessary to replace nnnnn with the ID of the custom field containing the content and mmmmm with the ID of the custom field containing the keyword.

Used parser functions
The links lead to the JWTC documentation because the parser functions are shared functionalities.