David Jenkins wrote:
I've been using Xpressive and think it's great. But, I think the following program shows two problems.
Problem 1: You get a runtime error if you uncomment the line "std::wcout << what2.position(0) << L'\n';"
Looks like you found a bug. position() doesn't work on nested_results. I'll look into it. Thanks for the report.
Problem 2: I think it should output: This is my face is my face
But it actually outputs: This is is
The pattern is:
wsregex subtokens = +alnum; wsregex token = as_xpr(L"This ") >> subtokens;
So, token will match "This " following by 1 or more alpha-numeric characters. The match stops after "is" because the next character is a space, which is not alpha-numeric.
Note that if you replace the nested regular expression with the (commented out) non-nested one, it still outputs the wrong thing. It outputs "This is" instead of "This is my face." Here is the program. Thanks for your help.
Same thing. Not a bug. -- Eric Niebler Boost Consulting www.boost-consulting.com