Regex Injection

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This functionality can be used for pattern-matching, performing wildcard searches, or just validating input from the HTTP request.

regex-validation.py
Python 
@app.route('/share/<path:link>')
def share(link):
  """Return the meta-data for a web-link shared by a user."""

  # Validate the URL has a protocol using a regular expression.
  link = link if re.match("^[a-z]+://.*", link) else f"https://{link}"

  # Go grab the meta-data.
  return OpenGraph(url=link).to_json()