It seems that when using sort_by parameter in ezfind fetch the sorting isn't right when the string contains some characters, for example spaces and/or dashes .

Also if the name contains ä/ö etc. characters they get sorted incorrectly (ä will get sorted first).

Steps to reproduce

In default ezwebin - installation, create a few Product - class objects under for example Products/Software - node.
Use for example the following names for the products (or something similar)
aaaaaa
aa-bb
aa-cc
ba-ab
bbbbb
ccccccccc
ffffffffffffffff
ff gg
gaga
gg ff
gggggg
OS Type I
Test-Product

Now if you use the following ezfind fetch:

{def $srch=fetch('ezfind', 'search', hash(
           'query', '',
           'limit', 20,
           'subtree_array', array(70),
           'class_id', 'product',
           'sort_by', hash('product/name', 'asc')
           ))}

{foreach $srch.SearchResult as $s}
   {$s.name}<br />
{/foreach}

70 is the node id for products/software in default ezwebin install.
What you end up with is a list of products which are certainly not ordered correctly.. What I get is this:
aaaaaa
ba-ab
aa-bb
bbbbb
aa-cc
ccccccccc
ffffffffffffffff
gaga
ff gg
gg ff
gggggg
Test-Product
OS Type I

What you will get may vary.. It seems there's absolutely no logic to the sorting. Sometimes names with dashes and or whitespaces get ordered correctly and sometimes the get ordered according to the string after the dash or whitespace..