Replace UNICODE chars to non-UNICODE in std::string

Question

Flaviu_ 1,091

I have the following std::string:

Mure╚Ö

How can I replace the last UNICODE char to non-UNICODE ?

I have tried:

s = std::regex_replace(s, std::regex("╚Ö"), "a");

but I got:

Unhandled exception at 0x75ECC3A2 in MyApp.exe: Microsoft C++ exception: std::regex_error at memory location 0x004FF450.

Beside of that, I have a warning:

warning C4566: character represented by universal-character-name '\u255A' cannot be represented in the current code page (1252)

RLWA32 52,676 Reputation points

2022-07-06T10:34:56.39+00:00

Well, to start with the std::string containing a mix of UNICODE and non-UNICODE characters is ill formed. How did this come about?
Flaviu_ 1,091 Reputation points

2022-07-06T11:03:23.93+00:00

Thank you RLWA32. Actually, that std::string is coming from a server, as json string. Yes, I can retrieve it as std::wstring, in this case, of course there is another char, not ╚Ö, but anyway, you are perfectly right, having this unicode chars inside of std::string is ill. That was just for testing purpose.

The question remain, how to replace UNICODE char to non-UNICODE char ?
RLWA32 52,676 Reputation points

2022-07-06T11:29:45.513+00:00

When I look at the string in Visual Studio ╚Ö appears as 2 unicode characters. Will they always appear at the end of the std::string object?
Flaviu_ 1,091 Reputation points

2022-07-06T12:54:45.627+00:00
Yes, in fact, there are two word with that UNICODE, all of them are close the word.

Mure╚Ö

and

Ludu╚Ö

Well, in fact, if I retrieve the string from the server as std::wstring, I got the same chars:
Ludu╚Ö and Mure╚Ö
RLWA32 52,676 Reputation points

2022-07-06T14:35:40.337+00:00

Sounds like you're working with UTF-8 strings from the server.

If the last two characters of the std::string object are known to be ╚Ö you can erase them from the string and then append the characters of your choosing.

1 answer

RLWA32 52,676 Reputation points

2022-07-06T10:34:56.39+00:00

Well, to start with the std::string containing a mix of UNICODE and non-UNICODE characters is ill formed. How did this come about?
Flaviu_ 1,091 Reputation points

2022-07-06T11:03:23.93+00:00

Thank you RLWA32. Actually, that std::string is coming from a server, as json string. Yes, I can retrieve it as std::wstring, in this case, of course there is another char, not ╚Ö, but anyway, you are perfectly right, having this unicode chars inside of std::string is ill. That was just for testing purpose.

The question remain, how to replace UNICODE char to non-UNICODE char ?
RLWA32 52,676 Reputation points

2022-07-06T11:29:45.513+00:00

When I look at the string in Visual Studio ╚Ö appears as 2 unicode characters. Will they always appear at the end of the std::string object?
Flaviu_ 1,091 Reputation points

2022-07-06T12:54:45.627+00:00

Yes, in fact, there are two word with that UNICODE, all of them are close the word.

Mure╚Ö

and

Ludu╚Ö

Well, in fact, if I retrieve the string from the server as std::wstring, I got the same chars:
Ludu╚Ö and Mure╚Ö
RLWA32 52,676 Reputation points

2022-07-06T14:35:40.337+00:00

Sounds like you're working with UTF-8 strings from the server.

If the last two characters of the std::string object are known to be ╚Ö you can erase them from the string and then append the characters of your choosing.

Answer 1

Flaviu_ 1,091

It's ok now, I used:

size_t pos;
while ((pos = temp.find(L"╚Ö")) != std::string::npos)
{
temp.replace(pos, 2, L"s");
}

I try to see if this could be accomplished with std::replace.

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