Regular Expression

http://stackoverflow.com/questions/406230/regular-expression-to-match-string-not-containing-a-word

I know it is possible to match for the word and using tools options reverse the match. (eg. by grep -v) However I want to know if it is possible using regular expressions to match lines which does not contain a specific word, say hede?

Input:

Hoho
Hihi
Haha
hede

# grep "Regex for do not contain hede" Input

Output:

Hoho
Hihi
Haha

Note that the solution to does not start with “hede”:
^(?!hede).*$

is generally much more efficient than the solution to does not contain “hede”:
^((?!hede).)*$

The former checks for “hede” only at the input string’s first position, rather than at every position.

How to remove new line in Notepad++?

You need something like a regular expression.

You have to be in Extended mode

If you want all the lines to end up on a single line use \r\n. If you want to simply remove emptylines, use \n\r as @Link originally suggested.

Replace either expression with nothing.