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I'm trying to use Unicode with Regex in an MFC app. The preprocessor variable UNICODE is defined. But I obtain an error on the line :

regex_search(sText, oResults, pRegExp); error C2665: none of the 4 overloads can convert parameter 1 from type 'class CString'

sText is a CString which has a "const wchar_t*" operator. The problem is why doesn't the regex_search prototype require a "const wchar_t*" when UNICODE is defined ?

You did, use sText.c_str() to get a const wchat_t*, otherwise there are too many overloaded forms of the function for the conversion to be found automatically.

I tried the "const wchar_t*" operator : regex_search((const wchar_t*) sText, oResults, pRegExp); but the problem is not here. VC++6 wrote : error C2664: '__thiscall boost::reg_expression >::boost::reg_expression >(const class boost::detail::allocator_adapter &)' : cannot convert parameter 1 from 'const unsigned short *' to 'const class boost::detail::allocator_adapter &' Reason: cannot convert from 'const unsigned short *' to 'const class boost::detail::allocator_adapter' No constructor could take the source type, or constructor overload resolution was ambiguous

You see that the reg_expression prototype contains "char"s and not "wchar_t"s. Are you sure that the only thing to do to use UNICODE is to put a #define UNICODE (I put it in my stdafx.h and in my project settings)?

Sorry, let me try again: the only effect that defining UNICODE has on the regex lib is on the definition of the POSIX C API functions. All the template classes and functions remain unchanged. So you need to be using boost::wregex not boost::regex for your regular expressions. John Maddock http://ourworld.compuserve.com/homepages/john_maddock/index.htm