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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
#include "stdregexp.hpp"
#include <cassert>
#include <cstdio>
#include <cwchar>
#include <cstdlib>

using namespace std;

typedef regular_expression::string_type str;
#define _T(t) L##t
#define CHART wchar_t
#define CONVERT(a, b) do { mbstowcs(a, b, 255); a[255] = '\0'; } while(false)
#define STRF "%ls"
#define _T(t) t
#define CHART char
#define CONVERT(a, b) strcpy(a, b)
#define STRF "%s"

bool parse_email(const str& to_match,
                 str& user_name,
				 str& host_and_domain,
				 str& domain_suffix)
    regular_expression email_expr(_T("^([A-Za-z0-9]+)@(.+)\\.(\\a+)$"));
	    return false;

	// the regular expression's format should ensure that all three
	// expressions match, or the expression doesn't match at all.
	assert(email_expr.matched(1) &&
	       email_expr.matched(2) &&

	user_name = email_expr[1];
	host_and_domain = email_expr[2];
	domain_suffix = email_expr[3];

	return true;

int main(int argc, char** argv)
	if(argc >= 2)
		str user_name, host_and_domain, domain_suffix;
		CHART buffer[255];
		CONVERT(buffer, argv[1]);
		if(!parse_email(buffer, user_name, host_and_domain, domain_suffix))
			printf("Not an email address\n");
			return 1;
		printf("User name: " STRF "\nHost/domain: " STRF "\nDomain suffix: " STRF "\n",
		return 0;
	printf("Usage: %s <email address>\n", argv[0]);
	return 1;

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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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