(https?:\/\/.+\.(?:jpg|gif|png|jpeg|bmp|webp|JPEG|JPG|PNG|GIF|BMP|WEBP))(\S*\b)
gi
<a href="\1" target="_blank" rel="noopener noreferrer"><img class="embed" src="\1"></img></a>

.embed
{
  max-height: 150px;
  max-width: 150px;
}