Function AR_REPLACEREGEX

src/arithmetic/string_funcs/string_funcs.c:405–469

given a string and a regular expression, return a string after replacing each regex match with a given replacement. string.replaceRegEx(str, regex, replacement) -> string

// return a string after replacing each regex match with a given replacement.
// string.replaceRegEx(str, regex, replacement) -> string
SIValue AR_REPLACEREGEX(SIValue *argv, int argc, void *private_data) {
	if(SI_TYPE(argv[0]) == T_NULL || SI_TYPE(argv[1]) == T_NULL) {
		return SI_NullVal();
	}

	char       *replacement = "";
	const char *str         = argv[0].stringval;
	const char *regex_str   = argv[1].stringval;

	if(argc == 3) {
		if(SI_TYPE(argv[2]) == T_NULL) {
			return SI_NullVal();
		}

		replacement = argv[2].stringval;
	}

	regex_t *regex;
	OnigErrorInfo einfo;
	OnigRegion *region = onig_region_new();

	int rv = onig_new(&regex, (const UChar *)regex_str, 
		(const UChar *)(regex_str + strlen(regex_str)), ONIG_OPTION_DEFAULT,
		ONIG_ENCODING_UTF8, ONIG_SYNTAX_JAVA, &einfo);
	if(rv != ONIG_NORMAL) {
		char s[ONIG_MAX_ERROR_MESSAGE_LEN];
		onig_error_code_to_str((UChar* )s, rv, &einfo);
		ErrorCtx_SetError("Invalid regex, err=%s", s);
		onig_free(regex);
		onig_region_free(region, 1);
		return SI_NullVal();
	}

	replace_regex_scan_cb_args args = {
		.res = NULL,
		.res_len = 0,
		.str = str,
		.str_ind = 0,
		.replacement = replacement,
		.replacement_len = strlen(replacement)
	};

	rv = onig_scan(regex, (const UChar *)str,
		(const UChar *)(str + strlen(str)), region, ONIG_OPTION_DEFAULT,
		replace_regex_scan_cb, &args);
	if(rv < 0) {
		char s[ONIG_MAX_ERROR_MESSAGE_LEN];
		onig_error_code_to_str((OnigUChar* )s, rv);
		ErrorCtx_SetError("Invalid regex, err=%s", s);
		onig_free(regex);
		onig_region_free(region, 1);
		return SI_NullVal();
	}

	onig_free(regex);
	onig_region_free(region, 1);

	// copy the remaining string