Looking for a string with regex and delete the whole line

Question

I am trying to find in Textpad a character with regex (for example "#") and if it is found the whole line should be deleted. The # is not at the beginnen of the line nor at the end but somewehre in between and not connected to another word, number or charakter - it stands alone with a whitespace left and right, but of course the rest of the line contains words and numbers.

Example:

My first line
My second line with # hash
My third line# with hash

Result:

My first line
My third line# with hash

How could I accomplish that?

Solution 1

Let's break it down:

^     # Start of line
.*    # any number of characters (except newline)
[ \t] # whitespace (tab or space)
\#    # hashmark
[ \t] # whitespace (tab or space)
.*    # any number of characters (except newline)

or, in a single line: ^.*[ \t]#[ \t].*

Solution 2

try this

^(.*[#].*)$

Debuggex Demo

or maybe

(?<=[\r\n^])(.*[#].*)(?=[\r\n$])

Debuggex Demo

Comments

[Tim Pietzcker]

This is essentially what my regex is doing, but with one problem: \s also matches a newline character, so the two lines a #\nbc would be matched/removed as well.

[MadConan]

@TimPietzcker: Fixed it.

[ChriS]

That works fine thanks, but is is there a way that the lines are moved up? So far when I replace it with nothing Textpad keeps the empty line.

[Tim Pietzcker]

In that case, you'll want to match the trailing \r\n as well. Just add (\r\n)? to the end of the regex (made optional since the newline may be missing on the last line of the file).