package astring

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Alternative String module for OCaml


Dune Dependency





Astring — Alternative String module for OCaml


Astring exposes an alternative String module for OCaml. This module tries to balance minimality and expressiveness for basic, index-free, string processing and provides types and functions for substrings, string sets and string maps.

Remaining compatible with the OCaml String module is a non-goal. The String module exposed by Astring has exception safe functions, removes deprecated and rarely used functions, alters some signatures and names, adds a few missing functions and fully exploits OCaml's newfound string immutability.

Astring depends only on the OCaml standard library. It is distributed under the ISC license.

Home page:


Astring can be installed with opam:

opam install astring

If you don't use opam consult the opam file for build instructions.


The documentation and API reference is automatically generated by ocamldoc from the interfaces. It can be consulted online or via odig doc astring.

Sample programs

If you installed Astring with opam sample programs are located in the directory opam config var astring:doc.