Add DebugLog message for bad pattern in rx operator #2723
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Prior to this pull request, if an rx operator used a non-compiling pattern (e.g. "@rx a(b"), ModSecurity would silently accept and process it, but simply producing a 'no match' every time.
This PR adds a message in DebugLog (at level 3) indicating that there was a problem.
TODO: similar processing for the remaining operators that use the Regex class.