The text in the first square brackets after url= indicates what URL the clickable text will load when clicked. The bit after, is the text you want to be clickable and the last set of square brackets let's the system know that there is no more text that needs to be clickable after this, allowing you to continue typing normal text.
These square brackets are called tags, the first one is the opening tag and the last one with the same text inside but prefixed with a / is the closing tag.
The url tag can be used for any address but all url's must be prefixed with their protocol (http:// ftp:// mailto: etc.)
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