[1] [CITE[RE2 regular expression syntax reference]]
([TIME[2016-04-22 00:36:58 +09:00]] 版)
<https://re2.googlecode.com/hg/doc/syntax.html>

[2] [CITE@en[google/re2: RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.]]
([TIME[2016-04-22 00:37:20 +09:00]] 版)
<https://github.com/google/re2>

[3] [CITE@en[Syntax · google/re2 Wiki]]
([TIME[2016-04-22 00:37:45 +09:00]] 版)
<https://github.com/google/re2/wiki/Syntax>