PCRE Regex

pcre.c

/* -*- compile-command: "gcc -Wall -Wextra -g $(pkg-config --cflags --libs libpcre2-8) pcre.c" -*- */
#define PCRE2_CODE_UNIT_WIDTH 8
#include <pcre2.h>
#include <string.h>
#include <stdio.h>

int main(void)
{
	pcre2_code *re;
	PCRE2_SPTR pattern = (PCRE2_SPTR)"^b";
	pcre2_match_data *match_data;
	int errornumber;
	PCRE2_SIZE erroroffset;
	int ret;
	size_t i;

	char *strings[] = {
		"foo",
		"bar",
		"baz",
	};

	re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0, &errornumber, &erroroffset, NULL);
	if (!re) {
		PCRE2_UCHAR buffer[256];
		pcre2_get_error_message(errornumber, buffer, sizeof(buffer));
		printf("PCRE2 compilation failed at offset %d: %s\n", (int)erroroffset,
		       buffer);
		return 1;
	}

	match_data = pcre2_match_data_create_from_pattern(re, NULL);
	for (i=0; i<(sizeof(strings)/sizeof(strings[0])); i++) {
		ret = pcre2_match(re, (PCRE2_SPTR)strings[i], strlen(strings[i]), 0, 0, match_data, NULL);
		if (ret < 0) {
			switch(ret) {
			case PCRE2_ERROR_NOMATCH:
				printf("pattern `%s' does not match: %s\n", pattern, strings[i]);
				break;
			default:
				printf("Matching error %d\n", ret);
				break;
			}

		}
		else {
			printf("pattern `%s' match: %s\n", pattern, strings[i]);
		}
	}
	pcre2_match_data_free(match_data);
	pcre2_code_free(re);

	return 0;
}