RE2Regex(const char* string, unsigned int options): casefold(false)
{
RE2::Options opts;
opts.set_posix_syntax(true);
opts.set_perl_classes(true);
opts.set_word_boundary(true);
opts.set_one_line(false);
opts.set_never_nl(true);
opts.set_literal((options & RO_LITERAL) != 0);
opts.set_log_errors(false);
std::string pattern;
if ((options & RO_IGNORECASE) && transformRegexCasefold(string, pattern, (options & RO_LITERAL) != 0))
{
casefold = true;
}
else
{
pattern = string;
opts.set_case_sensitive((options & RO_IGNORECASE) == 0);
}
re.reset(new RE2(pattern, opts));
if (!re->ok())
throw std::runtime_error("Error parsing regular expression " + (string + (": " + re->error())));
std::string prefix = getPrefix(re.get(), 128);
if (prefix.length() == 1)
matcher.reset(new LiteralMatcherFirst(prefix.c_str()));
#ifdef USE_SSE2
else if (prefix.length() > 1)
matcher.reset(new LiteralMatcherSSE(prefix.c_str()));
#endif
}