/usr/include/cutl/re/re.txx is in libcutl-dev 1.8.1+ds1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
namespace cutl
{
namespace re
{
//
// basic_regexsub
//
template <typename C>
void basic_regexsub<C>::
init (string_type const& s)
{
string_type r;
typename string_type::size_type p (parse (s, 0, r));
regex_ = r;
p = parse (s, p, sub_);
if (p + 1 < s.size ())
throw basic_format<C> (s, "junk after third delimiter");
}
//
// parse()
//
template <typename C>
typename std::basic_string<C>::size_type
parse (std::basic_string<C> const& s,
typename std::basic_string<C>::size_type p,
std::basic_string<C>& r)
{
r.clear ();
typename std::basic_string<C>::size_type n (s.size ());
if (p >= n)
throw basic_format<C> (s, "empty expression");
char d (s[p++]);
for (; p < n; ++p)
{
if (s[p] == d)
break;
if (s[p] == '\\')
{
if (++p < n)
{
// Pass the escape sequence through unless it is the delimiter.
//
if (s[p] != d)
r += '\\';
r += s[p];
}
// else {We ran out of stuff before finding the delimiter.}
}
else
r += s[p];
}
if (p == n)
throw basic_format<C> (s, "missing closing delimiter");
return p;
}
}
}
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