Will someone explain this javascript REGEX pattern?

Question

src.match(/^(https?\:\/\/.*)\//)

I know regular expressions but the syntax is not familiar to me. Can somebody explain to me what it's matching?

Answer 1

Matches anything that starts with http:// or https:// followed by any number of any character (.*), followed by another / slash.

The / slashes need to be escaped. I don't know why the colon is escaped too.