https://github.github.com/gfm/#example-627 If an autolink ends in a semicolon (;), we check to see if it appears to resemble an entity reference; if the preceding text is & followed by one or more alphanumeric characters. If so, it is excluded from the autolink: ...... www.google.com/search?q=commonmark&hl=en www.google.com/search?q=commonmark&hl; ......