Regex to find the last underscore and all text that follows it

The regex in the comment that you posted (and deleted) should work, although you should also be able to simplify that to...

_+[^_]*$

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I don't know Notepad++ so I am not sure exactly how it would apply a regex but you may need to specify options to make it a "multiline" match and to match "globally" or all occurrences. Also, it may be obvious, but the replacement string should be just empty.

I confirmed that _+[^_]*$ works in Notepad++ Replace as a REGEX, looks like a winner to me.

~bp

Thank you for your replies.. it seems to not stop at the end of the line and highlight four additional lines (randomly?)

And here is a test of the above regex...   https://regex101.com/r/fJ6hO6/1

Here is a better example... perhaps I should have given this to begin with..

MEX05\c.frank_plaCAAD6
MEX05\e.steve_playa6CE8F
MEX05\d.harry
MEX05\kdog
MEX05\scat
MEX05\j.rabbit
MEX05\c.mark_play79B61
MEX05\l.fancy
MEX05\n.pants
MEX05\a.farley
MEX05\davidspade

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It's very hard with the blurred image to know what is going on, but I understand that there might be data that you can't share with us!

Does the regex work with the original sample text? Can you come up with some sample text that DOES exhibit the issue that you have but that is non-sensitive data so that you can fully post it here?

What's different compared to test data you posted?

~bp

Our comments just posted at the same time :-)

awesome!
thank you!

You're welcome!

Try this:

_+[^_\n]*$

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~bp