Hi.
In Find/Replace window there are two options - Regular expressions and Allow backslash expressions but it seems to me that when I tick "Regular expressions" the "Allow backslash expressions" doesn't change anything. "Match whole word" and "Match case" also doesn't seem to work with RegExp.
So this seems to be a bug or maybe the options should be organized differently e.g.:
* Simple search expressions
[] Match case
[] Match whole word
[] Allow backslash expressions
* Regular expressions
BTW I've entered a wish for Find/Replace about PCRE parentheses matching (tagged expressions):
http://code.google.com/p/pnotepad/issues/detail?id=87
That would be an option in Regexp:
* Simple search expressions
[] Match case
[] Match whole word
[] Allow backslash expressions
* Regular expressions
[] PCRE tagged expressions
Having said all that I believe at least "Match case" should also be available for RegExp.