const regex = /(?:\<\!\-\-(?:(?!\-\-\>)\r\n?|\n|.)*?-\-\>)|(?:<(\S+)\s+(?=.*>)|(?<=[=\s])\G)(?:((?:(?!\s|=).)*)\s*?=\s*?[\"']?((?:(?<=\")(?:(?<=\\)\"|[^\"])*|(?<=')(?:(?<=\\)'|[^'])*)|(?:(?!\"|')(?:(?!\/>|>|\s).)+))[\"']?\s*)/gis;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('(?:\\<\\!\\-\\-(?:(?!\\-\\-\\>)\\r\\n?|\\n|.)*?-\\-\\>)|(?:<(\\S+)\\s+(?=.*>)|(?<=[=\\s])\\G)(?:((?:(?!\\s|=).)*)\\s*?=\\s*?[\\"\']?((?:(?<=\\")(?:(?<=\\\\)\\"|[^\\"])*|(?<=\')(?:(?<=\\\\)\'|[^\'])*)|(?:(?!\\"|\')(?:(?!\\\/>|>|\\s).)+))[\\"\']?\\s*)', 'gis')
const str = `In this case, \$url will indeed contain http://example.com/whatever.jpg. But what happens when you start getting HTML like this:
<img src='http://example.com/whatever.jpg'>
or
<img src=http://example.com/whatever.jpg>
or
<img border=0 src="http://example.com/whatever.jpg">
or
<img
src="http://example.com/whatever.jpg">
or you start getting false positives from
<!-- // commented out
<img src="http://example.com/outdated.png">
-->
<asd ASD=asd>
<!-- // commented out <img src="http://example.com/outdated.png"> -->
No quotes:
<iframe src=test.html target=xyz></iframe>
Self-closing tag:
<a href=test.html target=xyz/>
Self closing tag with a space before closure:
<a href=test.html target=xyz />
Double quotes:
<a href="test.html" target="xyz">
Single quotes:
<a href='test.html' target='xyz'>
Escaping double quotes:
<a href="test.html?val=1" title="\\"No rules exist\\" Andre Breton's quote">
Escaping single quotes (also with spaces between equals signs):
<a href = "test.html?val=1" title = 'Charlie\\'s Angels'>
Tag without opening (ignore attributes):
a href = "test.html?val=1" title='Charlie\\'s Angels'>
Tag without closure (ignore attributes):
<a href = "test.html?val=1" title='Charlie\\'s Angels'
`;
// 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