This regex will help you to parse html tag.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<picture>
<source srcset="mobile.png" ></source>
<source srcset="tablet.png" ></source>
<source srcset="desktop.png" ></source>
<img srcset="default.png">
</picture>
</body>
</html>
Output
<picture>
<source srcset="mobile.png" ></source>
<source srcset="tablet.png" ></source>
<source srcset="desktop.png" ></source>
<img srcset="default.png">
</picture>