function isValidWithUnicodeFlag(ecmaVersion, pattern, flag = "u") {
	if (flag === "u" && ecmaVersion <= 5) {
		// ecmaVersion <= 5 doesn't support the 'u' flag
		return false;
	}
	if (flag === "v" && ecmaVersion <= 2023) {
		return false;
	}

	const validator = new RegExpValidator({
		ecmaVersion: Math.min(ecmaVersion, REGEXPP_LATEST_ECMA_VERSION),
	});

	try {
		validator.validatePattern(
			pattern,
			void 0,
			void 0,
			flag === "u"
				? {
						unicode: /* uFlag = */ true,
					}
				: {
						unicodeSets: true,
					},
		);
	} catch {
		return false;
	}

	return true;
}
Checks if the given regular expression pattern would be valid with the `u` flag.
@param {number} ecmaVersion ECMAScript version to parse in.
@param {string} pattern The regular expression pattern to verify.
@param {"u"|"v"} flag The type of Unicode flag
@returns {boolean} `true` if the pattern would be valid with the `u` flag.
`false` if the pattern would be invalid with the `u` flag or the configured
ecmaVersion doesn't support the `u` flag.