Number of characters in a field
Return / count the number of characters in any text field including spaces.
Configuration
Create a Custom smart number field and use the General parsing mode.
Expression
%{count(findPattern(%{issue.cfnnnn}, "."))}
Please, note that it is necessary to replace nnnnn with the ID of the custom field containing the URL.
A common use case would be to count the characters of the work item description. This is helpful if you are preparing social posts and have a character limitation. The expression would then be:
%{count(findPattern(%{issue.description}, "."))}

Format
Custom format
Pattern
#,##0.##
Used parser functions
The links lead to the JWTC documentation because the parser functions are shared functionalities.