BCGSoft Professional Editor for MFC
CString CBCGPEditCtrl::m_strContinueStringSymbols

Defines a list of symbols that are used in the edit control to mark and exclude closing blocks from the string color blocks.

The default value is "\\".

Using this symbol you will be able to achieve right coloring for the strings like the following one:

"The \"test" environment"

Without this symbol the string above would look in the following way:

"The "test" environment"