Find index of last char in search string in string?

Hello.
I want to see if one string contains another string, and if so, return the index of the last char of the search string in the source string.

string::find() wont work for me because it returns the index of the first char of the search string, not the index of the last.

Do I need to write my own function?

Consider: using string::find(), you obtain the index of the first char found. Using string::length(), you obtain the length of the string being searched for. Add the them, subtract 1, and you get the index of the last char of the search string.

Quote:

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Originally Posted by laserlight

Consider: using string::find(), you obtain the index of the first char found. Using string::length(), you obtain the length of the string being searched for. Add the them, subtract 1, and you get the index of the last char of the search string.

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Ok, thanks.
I wrote a quick function implementing this approach.

Actually you wanted string::rfind() when you consider:

Code:

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string strSearch = "foo";
string strData = "stew-foo-foobar";
int npos = strData.rfind(strSearch);
if( npos != std::string::npos)
{
    npos += strSearch.size();
}

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or something like this. I just got home, its 111 degrees in the shade and I have since put my brain on a shelf.

Quote:

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Originally Posted by jeffcobb

Actually you wanted string::rfind() when you consider:

Code:

---

string strSearch = "foo";
string strData = "stew-foo-foobar";
int npos = strData.rfind(strSearch);
if( npos != std::string::npos)
{
    npos += strSearch.size();
}

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or something like this. I just got home, its 111 degrees in the shade and I have since put my brain on a shelf.

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No, because I wasn't trying to find the last occurance of a string in a string. I wanted to find the first occurance of a string in a string, then get the index of the last character of that string in a string. Savvy? :)
Besides, I already got it to work with laserlight's method.

OK; you weren't specific and all I got was "string::find() won't work because it returns the first occurrance...". No biggie as long as you only have one instance of the search string and that's all you want...

Quote:

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Originally Posted by jeffcobb

OK; you weren't specific and all I got was "string::find() won't work because it returns the first occurrance...". No biggie as long as you only have one instance of the search string and that's all you want...

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Yeah, that's all I want, because I read a single-line enum, enum value by enum value (comma to comma). I then use the function mentioned to find the position of the last char in the enum value name of the line read from that contains 'enum'. And it works well.