String.length is not working in handlebars template

[AndreasScharfCPB]

I am trying to use substring. But I cannot figure out the length of my String.
According to Handlebars a .length should be possible but within the Jenkins pipeline it is not.

Try {{person.lastname.length}} in https://handlebarsjs.com/examples/path-expressions-dot.html

Does not work in Jenkins with {{issue.length}}

[tomasbjerre]

This library uses this implementation of Handlebars:
https://github.com/jknack/handlebars.java

I do not see any length helper in those docs.

How do you want to use substring? What is the original value and what do you want it to be after substring?

[AndreasScharfCPB]

oh okay, that would explain why the function is not there.
I am using substring on String that is not static to cut the end that I dont need because it is wrapped by "[]". But as I do not know the length of the String I am not able to cut the last character from it.