在 CString 中查找以空格分隔的单词的最佳方法

Best way to find a whitespace-delimited word in a CString(在 CString 中查找以空格分隔的单词的最佳方法)

问题描述

示例:从 x = 1 的地方选择 *"

我想在somewhere"中找到以空格分隔的where"，而不是where".在示例中，where"由空格分隔，但也可以是回车、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:我知道正则表达式会很容易做到(正则表达式等效为where")，但我不想将正则表达式库添加到我的项目中这样做.

Note: I know regex would make it easy to do (the regex equivalent would be "where"), 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 的字符串操作方法，那么应该可以:

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(" 
	"), nTokenPos);

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

return FALSE; // not found

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