The most common way is using a parser generator (ocamlyacc or menhir, both are basically interchangeable 99% of the time). Parser combinators are a choice, but

The most common way is using a parser generator (ocamlyacc or menhir, both are basically interchangeable 99% of the time). Parser combinators are a choice, but honestly I think recursive descent parsers are more common than combinators in OCaml.