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Description

Re2 is a Limbo module for OS Inferno, which provide access to regular expression library re2. It's implemented as Inferno driver in C, so you'll need to rebuild Inferno to install it. Also this project contain C++ library re2wrap, required to call C++ library re2 from C.

Version 1.0.0 support most of re2 features (but API is different). Unsupported: custom regexp options, custom regexp/text encodings, auto-converting matched substrings into non-string types (like int), named capturing groups.

In version 1.1.0 regex(2)-compatible interface partially implemented (except executese()).

Install

Tested only on Linux. You must have re2 library (32-bit) installed.

Gentoo Linux

Add overlay "powerman" (using layman tool) and install dev-inferno/inferno (with USE flag "re2" enabled).

Using git clone

cd $INFERNO_ROOT
git clone https://github.com/powerman/inferno-re2.git tmp/inferno-re2
cp -a tmp/inferno-re2/* ./
rm -rf tmp/inferno-re2
./patch.re2

Then compile/install Inferno as usually.

Usage

See original docs for re2 library for regexp syntax, see /module/re2.m for this module API and re2(2) man page for more details.

Example

include "re2.m";
        re2: Re2;
        re, StrPos: import re2;
re2 = load Re2 Re2->PATH;

match := re2->match("Hello World", re("(?i)hello\\s+(\\w+)"));
if(match != nil)
    sys->print("captured in first parens: %s\n", match[0]);

compiled := re("\\b(\\w+)\\b");
sp := ref StrPos("some text here",0);
while((match = re2->matchnext(sp, compiled)) != nil){
    sys->print("found next word: %s\n", match[0]);
}