#include <stdio.h>
#include <sys/types.h>
#include <regex.h>
 
int main(int argc,char**argv)
{
	int status;
	int i;
	int cflags = REG_EXTENDED;
	regmatch_t pmatch[1];
	const size_t nmatch =1 ;
	regex_t reg;
	const char * pattern="^[A-Z]{2}\\w+@\\w{6}_\\w+.\\w+$";
        //const char * pattern="^[A-Z]{2}\\w+$";
        //const char * pattern="^\\w$";
	
	regcomp(®,pattern,cflags);
	status=regexec(®,argv[1],nmatch,pmatch,0);
        printf("%s",argv[1]);
	if(status == REG_NOMATCH)
		printf("no Match\n");
	else if(status ==0)
	{
		printf("match\n");
	}
}