Check_MK Werk 0669: Fixed regex matching in BI when using character groups [...]

ID: 0669 Title: Fixed regex matching in BI when using character groups [...] Component: BI Level: 1 Class: Bug Fix Version: 1.2.5i1 Regexes were not applied correctly when only using character groups as regex syntax without any other regex things. The option was not treated correctly since it was not detected as being a regex.