const regex = /(?:href=|src=|url\()(?:[\",']?)(.*image3\.png)[\",',\)]+?/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:href=|src=|url\\()(?:[\\",\']?)(.*image3\\.png)[\\",\',\\)]+?', 'g')
const str = `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
<meta name="description" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<div class="wrapper">
<img src="image1.png" alt="description goes here">
<img src="image2.png" alt="description goes here">
<img src="image3.png" alt="description goes here">
</div>
<p>This "image3.png" is not linked so it should be ignored</>
<p>This "app.js" is not linked so it should be ignored</>
<p>This "style.css" is not linked so it should be ignored</>
<script src="app.js"></script>
</body>
</html>
`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions