re2c_test.c

// re2c $INPUT -o $OUTPUT 
#include <assert.h>
#include <stdint.h>
#include <unistd.h>

/*!maxnmatch:re2c*/
static const uint64_t ERROR = ~0lu;

struct match {
	size_t so, eo;
};

static uint64_t lex(const char *YYCURSOR, struct match matches[])
{
	const char *YYMARKER;
	const char *yypmatch[YYMAXNMATCH * 2];
	const char *start = YYCURSOR;
	uint32_t yynmatch;
	/*!stags:re2c format = 'const char *@@;'; */
	/*!re2c
	re2c:yyfill:enable = 0;
	re2c:flags:posix-captures = 1;
	re2c:define:YYCTYPE = char;

	ip = ((([0-9]{1,3})[.]){3}[0-9]{1,3}) ;

	[ \t]* ("") [ \t]+ ((( ip ([/][0-9]+){0,1} )|(((([0-9a-f:]{2,39}))|(([0-9a-f:]{0,29}[:]((([0-9]{1,3})[.]){3}[0-9]{1,3}))))([/][0-9]+){0,1}))|([-a-z0-9._]+))[ \t\n]*[\x00] {
		for(size_t x = 0; x < yynmatch; x++) {
			matches[x].so = yypmatch[x*2] - start;
			matches[x].eo = yypmatch[x*2+1] - start;
		}
		return yynmatch;
	}
	* { return ERROR; }
	*/
}

int main()
{
	struct match matches[YYMAXNMATCH];
	uint64_t mno = lex(" 127.0.0.1/24", matches);
	return mno;
}