Remove empty lines using Regex and AltSearch

Question

I'm trying to match any white-space or blank lines in this test file, using AltSearch extension. For some reason, I can't match space between bar bar and line 4.

Here is test file. To post it to Stack Overflow, I changed spaces to periods and tabs to TABs. (When you will change it back for personal testing, note, there is TABTABTAB below line 3, it's easy to overlook).

line1

line2
..............TAB

line3
TABTABTAB

foo foo
bar bar



line4


TAB..............

line5

.................

line6

And here is 2 versions of my regex. Both works identically for me.

\p*^\s*\t*\p+
\p*^(\s||\t)*\p+

I know, batch script inside AltSearch will be more easy way (and I already have working batch). My interest is about don't using batch.

Also doesn't work. I don't understand, maybe this AltSearch is just buggy as hell?

(\p*^\s*\p+)||(\p*^\p*)

Answer 1

Use the below regex

^$

Make sure you check the "Regular expressions" checkbox after expanding "Other Options" section.

Here is the screenshot from the Help in LibreOffice

Ideally, ^\s*$ should work as I commented, it's strange it's not working in LO.