# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/\s*<script src="\\/((\w+)[\w.\\/]+)"><\\/script>/\n<script>\n const $2Script = document.createElement('script');\n $2Script.type = 'text\/javascript';\n $2Script.async = true;\n $2Script.src = '$1';\n document.body.appendChild($2Script);\n<\/script>\n/g;t' <<< "<!DOCTYPE html>
<html>
<head>
<meta charset=\"utf-8\">
<meta http-equiv=\"Content-Security-Policy\" content=\"default-src * data: gap: https://ssl.gstatic.com; style-src * 'unsafe-inline'; script-src * 'unsafe-inline' 'unsafe-eval'\">
<meta name=\"viewport\" content=\"width=device-width,initial-scale=1.0\">
<title>atomic-project</title>
</head>
<body>
<div id=\"app\"></div>
<!-- built files will be auto injected -->
<script src=\"/app.js\"></script><script src=\"/app.js\"></script><script src=\"/app.js\"></script><script src=\"/app.js\"></script></body>
</html>
"
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html