Regex: Skip whitespaces / span lines

[Til Schubbe]

Hi,

I like to configurate mutt automatically e.g. if I subscribe to a
new mailinglist, which needs to be announced to mutt. So I like to
add some new lines to certain (already existing) instructions. I
intend to have a .muttrc_mailinglists like this:

# Anchor No. 1
folder-hook ' \
        ml1| \
        ml2| \
        ml3| \
        dummy' \
        'some action'

# Anchor No. 2
folder-hook ' \
        ml2| \
        ml3| \
        ml5| \
        ml8| \
        dummy' \
        'some other action'

The problem is that mutt handles the preceeding whitespaces (TAB) as
part of the regex. How can I span a config-instruction, which
contains a regex, over multiple lines?

Regards
Til