Question

I have been fighting this problem with the help of a RegEx cheat sheet, trying to figure out how to do this, but I give up… I have this lengthy file open in Notepad++ and would like to remove all lines that do not start with a digit (0..9). I would use the Find/Replace functionality of N++. I am only mentioning this as I am not sure what Regex implementation is N++ using… Thank you

Example. From the following text:

1hello
foo
2world
bar
3!

I would like to extract

1hello
2world
3!

not:

1hello

2world

3!

by doing a find/replace on a regular expression.

Answer 1

You can clear up those line with ^[^0-9].* but it will leave blank lines.

Notepad++ use scintilla, and also using its regex engine to match those.

\r and \n are never matched because in
Scintilla, regular expression searches
are made line per line (stripped of
end-of-line chars).

http://www.scintilla.org/SciTERegEx.html

To clear up those blank lines, only way is choose extended mode, and replace \n\n to \n, If you are in windows mode change \r\n\r\n to \r\n