Created attachment 22031 [details]
bug

reassigned to SBA.

help bug
this is true, seems to be a bug in the help
reassigned to ufi
set target OOo later
set prio to P4

this bug reoccurs is in all versions till now (current buid scr680_m77)

It's not bug in help. It's bug in regexp engine. Tab is space char class
[:space:] in every regexp  implementation what I know. I guess why regexps in
OOo not same as standart as POSIX.2 or other de facto standart gnu grep, gnu
sed, perl?

$ grep '^[[:space:]]' <(printf "\twith tab\n with space\nwithout space")
        with tab
 with space
$ grep -v '^[[:space:]]' <(printf "\twith tab\n with space\nwithout space")
without space

reassigned to SBA

SBA: When the current behavior is the designed behavior (as it is), then "[....]
in every regexp implementation what I know" does not make it automatically a
defect. => Type changed to Enhancement.

Reassigned to Requirements.

I'm sorry to disagree, but the 2.3 Help says:
"[:space:] represents a whitespace character such as space"
and the implementation does not do that.

So it *is* a bug, either with Help or the implementation. Someone needs to do 
something!

How about in Help:
"[:space:] represents a space character (but not other whitespace characters)"

as a temporary measure, to inform people who use other regex like in Perl that 
do it differently.

Since version 3.4, [:space:] matches to tab also. 
Current help page for list of regular expression contains: 
> [:space:] Represents a space character (but not other whitespace characters).
The page should be updated.