For whatever reason, it seems to have left the ? menu. F1 brings up About.
file:///C:/Program%20Files%20%28x86%29/Notepad++/user.manual/documentation/notepad-user-manual/searching/normal-search.html
(in browser) is an example of where I could find it before updating recently (mine was around v6.3.x at the time), using Windows 7. I can still find it there and you may have it available as well. In case you don’t, here’s the list:
\\ - Backslash character; \t – TAB character; \r – CR character; \n – LF character; \0 – NULL character; \x## - Hexadecimal value (between 00 and FF); \u#### - Extended hexadecimal value (between 0000 and FFFF, meant for Unicode characters); \d### - Decimal value (between 000 and 255); \o### - Octal value (between 000 and 377); \b######## - Binary value (between 00000000 and 11111111).However, I have a problem with searching things like “w\0o\0r\0d”. It seems to combine the characters in a weird way, and I’m not sure why. Same happens with \x00 instead of \0. \x00o might find \x00n instead, or \0\0. I don’t know if I’m doing something weird, but it seems like this should work fine.