Answer
As mentioned by the user Wellington, you should follow the steps:
Go to Search- > Replace .
Set the value of the Search / Find field: (<.*?(?=mensagem).*?>)(.*?)(<.*?>)|(.*)
Set the value of the Replace With field: \ 2 or $ 2.
Set the search mode to: Regular expression .
Click the Replace All button.
This will replace all text with content that has the keyword message within the tag.
You can test this regex here.
If you have not solved your problem, please comment here what I expected, what happened wrong and I try to solve it, I hope I have helped: D
Explanation of Regex
This regex has 4 groups of captures, I will explain what each one does so you can understand better
(<.*?(?=mensagem).*?>)
Group 1 will capture everything that is between the tag, if you have the word message in any position before the character " > ", for this I used one positive lookahead , it determines that everything between (?= and ) is a condition for capturing what is before.
(.*?)
Group 2 will only be triggered if group 1 captures something, since it is in the same expression and is not after an OR operator, it captures everything but breaks of lines and for as soon as another character of the next expression is found.
(<.*?>)
Group 3 captures everything between tags after group 2, the " < " tag also serves as a limiter for group 2 to stop capture when you find it.
|(.*)
Group 4 is an expression after the OU operator, this means that if the regex does not capture with the previous expression, it will try to capture with that logo I just inserted a ". " operator to catch any character other than line break ( \n ), so anything that does not match your search will be deleted by replacing everything with the contents of group 2.
