> For the complete documentation index, see [llms.txt](https://docs.helmut.de/helmut4-releases/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.helmut.de/helmut4-releases/v4.7.0/helmut4-components/streamdesigner/wildcards/functional-wildcards.md).

# Functional Wildcards

Functional wildcards enable interaction with the input itself by entering an input (?). A string, a file path or a wildcard itself can serve as input. It is therefore possible to nest wildcards.