Guten Tag Thorsten Schöning,
am Montag, 1. Oktober 2012 um 18:44 schrieben Sie:

> Could you tell me the difference to the one with the error? Thanks!

The difference is, that only top level branches can be of different
length and I use pkcs7 etc. underneath the top level branch. Seems I
have to rewrite this somehow...

Branches that match different length
strings are permitted only at the top level of a lookbehind  assertion.
This is an extension compared with Perl, which requires all branches to
match the same length of string. An assertion such as

      (?<=ab(c|de))

is not permitted,

http://www.pcre.org/pcre.txt

Mit freundlichen Grüßen,

Thorsten Schöning

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