在CString中找到一个空格分隔的单词的最佳方式 [英] Best way to find a whitespace-delimited word in a CString

问题描述

例如： select * from where where x = 1

我想找到whitespace-分隔其中，而不是其中 $ c>。在示例中，where由空格分隔，但它可以是回车，制表符等。

I want to find the whitespace-delimited "where", but not the "where" within "somewhere". In the example "where" is delimited by spaces, but it could be carriage returns, tabs etc.

注意：我知道regex会很容易做等价的将是 \bwhere \b ），但我不想添加一个regex库到我的项目，只是这样做。

Note: I know regex would make it easy to do (the regex equivalent would be "\bwhere\b"), but I don't want to add a regex library to my project just to do this.

推荐答案

如果你想使用纯MFC方法的字符串操作，那么这应该工作：

If you wanted to use the pure MFC method of string manipulation, then this should work:

CString strSql = _T("select * from somewhere where x = 1");

int nTokenPos = 0;
CString strToken = strSql.Tokenize(_T(" \r\n\t"), nTokenPos);

while (!strToken.IsEmpty())
{
    if (strToken.Trim().CompareNoCase(_T("where")) == 0)
        return TRUE; // found
    strToken = strSql.Tokenize(_T(" \r\n\t"), nTokenPos);
}

return FALSE; // not found

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