BBEdit: Text Filter cannot handle Umlauts (ä,ü,ö)

Question

The target is: format text as columns.

I created the following text filter in BBEdit 11.6.4 (latest version):

#!/bin/sh
sed 's/   */ ¶/g' | column -s '¶' -t

I applied it to the following text (UTF-8 document):

zot foo   bär   pak
lorem sit   ipsum   doloret

Expected result:

zot foo     bär     pak
lorem sit   ipsum   doloret

Real result:

zot foo     bär      pak
lorem sit   ipsum   doloret

As soon as an umlaut exists in the text, the number of inserted blanks are not correct. It seems the reg ex machine of BBEdit treats umlauts in a special way.

Do you know a solution?

Note: The text filter works fine for any text without umlauts.

Answer 1

I get a solution in the "BBEdit Google Groups":

https://groups.google.com/forum/#!topic/bbedit/yuLz48rIyoc

Seems to be a bug in BBEdit.