Regex Positive lookahead get first occurrence

I Have String like this, and I want capture characters between .html and the first slash

http://example.org/some-path/some-title-in-1978.html

This part some-title-in-1978, for that I came up with this regex:

/\/.+?(?=\.html)/ and result are not what i want, it's like this:

//domain.org/some-path/some-title-in-1978

via user1086010