Https regex

1. What is the regex expression for https?
2. What is the regex for valid http and https URL?
3. How to validate a URL using regex?
4. How to check if string starts with http or https in JavaScript?

What is the regex expression for https?

The expression [(http)(https)] translates to "match a ( , an h , a t , a t , a p , a ) , or an s ." (Duplicate characters are ignored.) You forgot to escape / using \. So it would be ^https?:\/\/ .

What is the regex for valid http and https URL?

The regex will consider a URL valid if it satisfies the following conditions: The string should start with either http or https followed by ://. The combined length of the sub-domain and domain must be between 2 and 256. It should only contain alphanumeric characters and/or special characters.

How to validate a URL using regex?

The JavaScript syntax for URL validation using regex is: function isValidURL(string) var res = string. match(/(https?:\/\/(?:www\. |(?!www))[a-zA-Z0-9][a-zA-Z0-9- ]+[a-zA-Z0-9]\.

How to check if string starts with http or https in JavaScript?

JavaScript – Check if String starts with http

If the value is str starts with 'http , then the above expression returns true , or else, the expression returns false . We can use this expression in an if-else statement as follows.