Also see Google Scholar and DBLP.
For some papers, you can find additional information by following the link titled "more information" (topics include errata, connections to other papers, anecdotes, and random ramblings).

Journal and Conference Publications:

14. Joining Extractions of Regular Expressions (with Benny Kimelfeld and Liat Peterfreund)
13. Deterministic Regular Expressions With Back-References (with Markus L. Schmid)
12. A Logic for Document Spanners
11. Document Spanners: From Expressive Power to Decision Problems (with Mario Holldack)
10. Fast Learning of Restricted Regular Expressions and DTDs (with Timo Kötzing)
9. Expressiveness and static analysis of extended conjunctive regular path queries (with Nicole Schweikardt)
8. Extended Regular Expressions: Succinctness and Decidability
7. Weakly Unambiguous Morphisms (with Hossein Nevisi, Daniel Reidenbach)
6. Inferring Descriptive Generalisations of Formal Languages (with Daniel Reidenbach)
5. Inclusion Problems for Patterns With a Bounded Number of Variables (with Joachim Bremer)
4. Existence and Nonexistence of Descriptive Patterns (with Daniel Reidenbach)
3. Bad News on Decision Problems for Patterns (with Daniel Reidenbach)
2. The Unambiguity of Segmented Morphisms (with Daniel Reidenbach)
1. Unambiguous Morphic Images of Strings (with Daniel Reidenbach, Johannes C. Schneider)

Festschrift Contributions: