Changing embedded text in Notepad++

Good morning. I have a situation where I need to replace a keyword that may be anywhere on a line. The catch is that I need to add a comment line above. If the keyword is at the start of the line, I can do:

OldKeyword stuff stuff stuff

Replace: \nOldKeyword With: \nhashtag Comments\nNewKeyword

with extended search enabled. But if it's embedded, I need to take:

stuff stuff stuff OldKeyword stuff stuff stuff

And turn it into:

hashtag Comments

stuff stuff stuff NewKeyword stuff stuff stuff

retaining the code before the keyword.

Any help is Greatly appreciated.

I tried \n asterisk OldKeyword With: \n hashtag Comments\n asterisk NewKeyword

But it's as if that would be both extended and regular expression simultaneously.

You could use a capture group matching 0+ times any character except a newline, and then use that group in the replacement.

Instead of starting the match with a newline, you can use an anchor to also match the first line.

^(.*?)OldKeyword

In the replacement use:

hashtag Comments\n$1NewKeyword

See the replacement in the regex 101 demo