[BUG] Length of variable `{{interactsh-url}}` computed incorrectly

[darses]

Is there an existing issue for this?

• I have searched the existing issues.

Current Behavior

The dsl function len("{{interactsh-url}}") returns the length of the literal text {{interactsh-url}}. This makes it impossible to compute the length of a payload that includes an interact.sh domain.

Expected Behavior

Make the DSL function len() return the length on the expanded {{interactsh-url}} URL.

Steps To Reproduce

Relevant log output

Environment

- OS: Fedora Linux
- Nuclei: v3.4.7
- Go: go1.24.4

Anything else?

I see two solutions:

1. Compute the correct length for the expanded variable, so the entire domein
2. Provide a second variable {{interact-len}} if computing it dynamically is impossible

Maybe this issue belongs in the projectdiscovery/nuclei repository, but I am not sure on that.