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Find HTML comments

Find all HTML comments in the text:

let regexp = /your regexp/g;

let str = `... <!-- My -- comment
 test --> ..  <!----> ..
`;

alert( str.match(regexp) ); // '<!-- My -- comment \n test -->', '<!---->'

We need to find the beginning of the comment <!--, then everything till the end of -->.

An acceptable variant is <!--.*?--> – the lazy quantifier makes the dot stop right before -->. We also need to add flag s for the dot to include newlines.

Otherwise multiline comments won’t be found:

let regexp = /<!--.*?-->/gs;

let str = `... <!-- My -- comment
 test --> ..  <!----> ..
`;

alert( str.match(regexp) ); // '<!-- My -- comment \n test -->', '<!---->'