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Henry Spencer's Regexp Engine Revisited

, 2 Jul 2003
A small, Unicode-aware regular expression engine based on Henry Spencer's early work
#ifndef STD_REGEXP_HPP__
#define STD_REGEXP_HPP__

#include <string>
#include <stdexcept>
#include <vector>

#include "regexp.h"

class regular_expression_error : public std::runtime_error
	regular_expression_error(int error_code, regexp* re);
	~regular_expression_error() throw() {};

	int code() const;
	const char* message() const;

	int code_;
	std::string message_;

class regular_expression
	typedef wchar_t CharT;
	typedef std::wstring string_type;
	typedef char CharT;
	typedef std::string string_type;

	typedef string_type::size_type size_type;
	typedef string_type::const_iterator const_iterator;

	regular_expression(const CharT* pattern);
	regular_expression(const string_type& pattern);

	bool exec(const CharT* match);
	bool exec(const string_type& match);

	bool matched(size_type sub_exp = 0) const;
	const_iterator begin(size_type sub_exp = 0) const;
	const_iterator end(size_type sub_exp = 0) const;
	string_type operator[] (size_type sub_exp) const;

	size_type size() const;

	class regexp_wrapper

		regexp* get();
		regexp** operator&();

		regexp* wrapped_;

		regexp_wrapper(const regexp_wrapper&);
		regexp_wrapper& operator=(const regexp_wrapper&);
	regexp_wrapper compiled_;
	string_type match_;
	std::vector<regmatch> matches_;

	// internal utilities
	void common_init(const CharT* pattern);
	void reset();
	// disable copying
	regular_expression(const regular_expression&);
	regular_expression& operator=(const regular_expression&);

#endif /* STD_REGEXP_HPP__ */

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About the Author

Web Developer
Canada Canada
I'm a senior software developer, working at Silanis Technology ( I've acquired quite a bit of experience (usually the hard way!) in Win32 and raw COM programming on the job. In my spare time, I like to monkey around with POSIX code.

I'm mostly interested in portable C++ libraries. I'm happiest when I develop portable C++ code--C++ being such a powerful language as long as one keeps clear of the rather nasty subtleties of the language.

I hope the articles I contribute will be of some help to someone. If even one person gains a few hours through use of that code, I'll be very happy.

When not coding, I like to listen to Anime and try to learn Japanese. It's not working too well so far, unfortunately. :{)

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