Get complete substrings from a string

A well-structured HTML parser, for example: GitHub - philss/floki: Floki is a simple HTML parser that enables search for nodes using CSS selectors. · GitHub, may be a more reliable option.

Naive approach:

str = """
<div class=wp-block-supertrends-figure><div style=overflow: hidden; padding-top: 
56.25%; position: relative;><iframe src=https://player.vimeo.com/video/687889699 
frameborder=0 allowfullscreen=></iframe></div><div class=title>Video</div><div 
class=text>Video description</div></div>
"""

Regex.run(~R|https://player.vimeo.com/video/[0-9]+|, str)
# ["https://player.vimeo.com/video/687889699"]

EDIT: Sorry, I just realized, there can be more URL formats. So consider this irrelevant.

iex> Regex.scan(~r/src=(\S+)/, string <> string, capture: :all_but_first)
[
  ["https://player.vimeo.com/video/687889699"],
  ["https://player.vimeo.com/video/687889699"]
]