Hampi is a solver for string constraints. Hampi is designed for constraints generated by program analysis tools, automated bug finders, intelligent fuzzers.

Hampi constraints express membership in regular languages and bounded context-free languages. Hampi constraints may contain context-free-language definitions, regular-language definitions and operations, and the membership predicate. Given a set of constraints, Hampi outputs a string that satisfies all the constraints, or reports that the constraints are unsatisfiable.

The Hampi paper won ACM SIGSOFT Distinguished Paper Award at ISSTA'09 (International Symposium on Software Testing and Analysis, Chicago, USA).
Adam Kiezun, Vijay Ganesh, Philip J. Guo, Pieter Hooimeijer, Michael D. Ernst
HAMPI: A Solver for String Constraints

Hampi project page

http://people.csail.mit.edu/akiezun/hampi