# Erlang NIF bindings for the re2 regex library

## Building and Installing

**re2** is built with [rebar](https://github.com/rebar/rebar/) and we do expect
`rebar` to be in the search `PATH`. If `rebar` can not be found in the search
`PATH`, it will be automatically downloaded to `support/rebar` for local use.

To build, execute `make` or `rebar compile`.

## re2 sources

If re2 is found on the system, it will be used. Otherwise, the
[re2](https://github.com/google/re2) dependency is automatically downloaded to
`c_src/re2` by the build script. If you prefer to link against re2 as found on
the system, you can set the env var `SYSTEM_RE2`. If you set `SYSTEM_RE2` and
the library can not be found, it will fall back to a local copy, as if you
didn't use the env var. If you want to override the re2 version that is fetched
and built, when not using system re2, you can do so by setting `RE2_REV` to a
git rev.

Unless otherwise noted, the [re2](https://github.com/google/re2) source files
are distributed under the  BSD-style license found in `c_src/re2/LICENSE`.