Rocket.Chat.ReactNative/app/utils/url.ts

export const isValidURL = (url: string): boolean => {
	const pattern = new RegExp(
		'^(https?:\\/\\/)?' + // protocol
			'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|' + // domain name
			'((\\d{1,3}\\.){3}\\d{1,3}))' + // OR ip (v4) address
			'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*' + // port and path
			'(\\?[;&a-z\\d%_.~+=-]*)?' + // query string
			'(\\#[-a-z\\d_]*)?$',
		'i'
	); // fragment locator
	return !!pattern.test(url);
};

// Use checkUseSsl: false only if server url starts with http://
export const isSsl = (url: string): boolean => !/http:\/\//.test(url);