Domain-specific languages (DSL) provides high-level functions making applications easier to write, and to maintain. Unfortunately, many applications are written from scratch and poorly documented, which make them hard to maintain. An ideal solution should be to rewrite them in a appropriate DSL. In this paper, we present TeMa (Template Matcher), an automatic tool to recognize high-level functions in source code. Preliminary results show how TeMa can be used to reformulate Fortran code into Signal Processing Language (SPL) used in SPIRAL. This opens new possibilities for domain-specific languages.