In TFS and VSTS one can create a whole list of triggers that particular build-jobs. In the drop-down one can select an existing branch and all done. But if you like to trigger your CI build-jobs for all feature branches one can use wildcards too.
To do so you have to expand the drop-down and enter the filter text into the Textbox that looks like a search box. Press ENTER and TFS / VSTS will use exactly this filter. Its not quite intuitive but works.
See the following screenshots.