compliance-check: Adds correct search delimiter

* Adds the currently used regex_search_delimiter (//) to
  compliance_check.py

* Now raises an exception in RawTextSearch in the case of a wrong
  search delimiter that would otherwise lead to an infinite loop.

Signed-off-by: Martin Vesper <martin.vesper@cern.ch>
Merge pull request #32 from mvesper/rawtext_search_delimiter_fix

compliance-check: Adds correct search delimiter