Improve preg error handling

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      At several places pref functions are used.

      In an case of an error this is not recognized (preg_replace returns null). This should be improved. Otherewise in certain situations we can get errors and do not know, where they come from. See VISUAL-33.

            Assignee:
            Axel Becher
            Reporter:
            Thomas Lauria
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              Created:
              Updated: