In order to insert after the `` tag, we must first find it. We can use the regular expression pattern `pattern:` for that. In this task we don't need to modify the `` tag. We only need to add the text after it. Here's how we can do it: ```js run let str = '......'; str = str.replace(//, '$&

Hello

'); alert(str); // ...

Hello

... ``` In the replacement string `$&` means the match itself, that is, the part of the source text that corresponds to `pattern:`. It gets replaced by itself plus `

Hello

`. An alternative is to use lookbehind: ```js run let str = '......'; str = str.replace(/(?<=)/, `

Hello

`); alert(str); // ...

Hello

... ``` As you can see, there's only lookbehind part in this regexp. It works like this: - At every position in the text. - Check if it's preceeded by `pattern:`. - If it's so then we have the match. The tag `pattern:` won't be returned. The result of this regexp is literally an empty string, but it matches only at positions preceeded by `pattern:`. So we replaces the "empty line", preceeded by `pattern:`, with `

Hello

`. That's the insertion after ``. P.S. Regexp flags, such as `pattern:s` and `pattern:i` can also useful: `pattern://si`. The `pattern:s` flag makes the dot `pattern:.` match a newline character, and `pattern:i` flag makes `pattern:` also match `match:` case-insensitively.