@m-andre-z-eckenrode: I’ve been looking, but so far I have not found a potential cause for the results you obtained. @guy038’s post just led me to think of something. The debug information in the post where you asked about the failure to replace in Notepad++ showed that you have Columns++ installed. The search and replace code Search++ uses is derived from what I used in Columns++, but I have made some changes. Would you try and see if you can get the search in Columns++ to misbehave under the same circumstances as the one in Search++? (It’s fine to use the installed version of Notepad++ for this test.) Knowing whether or not the fault also appears in Columns++ could help me narrow the scope of what I could be missing. As always, I understand if you don’t have the time for this sort of thing. Thank you for your observations so far, and many thanks in advance if you are willing to do this additional test.

@gfclemencin , Presumably related to https://github.com/notepad-plus-plus/notepad-plus-plus/issues/18226 https://github.com/notepad-plus-plus/notepad-plus-plus/issues/18248 The developer knows about the problem, and I believe his intention is to include a fix in the next version (though it hasn’t been merged yet). When the v8.9.8 Release Candidate comes out (probably next week), I’d recommend trying it, and reporting any remaining problems in the new Topic about v8.9.8-RC that will be created in the Announcement category