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I'm trying to test a few regexes, so I started out simply by trying to find some hex strings in an open file, in hex view. I'm new at TextPad, so perhaps I'm proceeding incorrectly. My file has the following hex string:
00 00 00 00 00 EA 65 12 45 00

The regex \x12\x45\x00 finds 0x124500
The regex \xEA\x65 finds nothing
The regex \x45 finds both 0x45 and 0x65

What am I doing wrong? Thanks.

I would tick "Hex" under Conditions when using binary view. That way you don't need to use a regex and you can just enter "124500" in your first example. I'm also struggling with the \x format when in binary view having ticked "Text" under Conditions. Perhaps using "text" in binary view makes no sence? Just my 0.02usd. HTH

To add to this...

The reason why the regex \x45 matches both 0x45 and 0x65 is that they are upper- and lower-case 'E', respectively. Try selecting Match case.

And there does seem to be a bug associated with regexes containing lower-case letters represented in hex (e.g., \x65) when Match case is not selected, in both text and binary view. They don't seem to match anything.