The task of parsing a file, or data of various types, is a common one for programmers. We already learned about Haskell's support for regular expressions back in the section called “Regular expressions in Haskell”. Regular expressions are nice for many tasks, but they rapidly become unwieldy, or cannot be used at all, when dealing with a complex data format. For instance, we cannot use regular exp
Parsec is a free monadic parser combinator library for Haskell. Allthough combinator parsing is well known in literature, most libraries are only implemented for personal use or for small research examples. Parsec is designed from scratch as an industrial-strength parser library. It is simple, safe, well documented, has extensive libraries and good error messages. It is also fast, doing thousand
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