#include <stdlib.h>
#include <stdio.h>
#include <regex.h>

int main()
{
        char *line = NULL;
        int ret;

        /*
         * \b (backspace) is used to produce bold or underlined text.
         */
        char *ref_regex = "[A-Za-z\b._-]+\\(..?\\)";
        static regex_t *preg;
        regmatch_t pmatch[1];
        char *line_ptr;
        size_t line_length;

        if (preg == NULL) {
                preg = calloc(sizeof(regex_t), 1);
                if (ret = regcomp(preg, ref_regex, REG_EXTENDED) != 0) {
                        fprintf(stderr, "regcomp() failed: %d\n", ret);
                        exit(1);
                }
        }
                
        while (1) {
                /* position to next non empty line */
                while (1) {
                        ret = getline(&line, &line_length, stdin);
        
                        if (ret == -1) {
                                regfree(preg);
                                return 0;
                        }
                        if (line_length > 1)
                                break;
                        if (line_length < 1) {
                                regfree(preg);
                                return 0;
                        }
                }
                
                printf("%s: while finished: %ld\n", __func__, line_length);
                line_ptr = line;

                while (1) {
                        ret = regexec(preg, line_ptr, 1, pmatch, 0);

                        if (ret != 0)
                                break;

                        printf("regexec match \"%s\"\n", line_ptr + pmatch[0].rm_so);

                        line_ptr += pmatch[0].rm_eo;
                }
        }
}