How do I mix patterns and text?

[lindsaymacvean]

Can I mix patterns and text like this

"permalinks": {
                  "structure": "author_:basename_crud:ext"
                }

Im using the :basename and :ext patterns in this structure. The author_ and _crud are static text that should be put out on filename for every page.

[assemblebot]

@lindsaymacvean Thanks for the issue! If you're reporting a bug, please be sure to include:

• The version of assemble you are using.
• Your assemblefile.js (This can be in a gist)
• The commandline output. (Screenshot or gist is fine)
• What you expected to happen instead.