For questions about linguistic applications of the hierarchy of formal languages or grammars named after Noam Chomsky.

Note that this tag is intended only for linguistic applications of the Chomsky hierarchy, like syntax parsing, using Finite State Transducers for phonology, etc.

The Chomsky hierarchy and formal languages are also heavily used in Computer Science, for questions without a clear and stated application in linguistics, consider one of the following two stackexchanges Computer Science or Theoretical Computer Science.