/usr/include/ruby-2.5.0/ruby/regex.h is in ruby2.5-dev 2.5.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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regex.h -
$Author: nobu $
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#ifndef ONIGURUMA_REGEX_H
#define ONIGURUMA_REGEX_H 1
#if defined(__cplusplus)
extern "C" {
#if 0
} /* satisfy cc-mode */
#endif
#endif
#ifdef RUBY
#include "ruby/oniguruma.h"
#else
#include "oniguruma.h"
#endif
RUBY_SYMBOL_EXPORT_BEGIN
#ifndef ONIG_RUBY_M17N
ONIG_EXTERN OnigEncoding OnigEncDefaultCharEncoding;
#define mbclen(p,e,enc) rb_enc_mbclen((p),(e),(enc))
#endif /* ifndef ONIG_RUBY_M17N */
RUBY_SYMBOL_EXPORT_END
#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */
#endif
} /* extern "C" { */
#endif
#endif /* ONIGURUMA_REGEX_H */
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