在 CString 中查找以空格分隔的单词的最佳方法
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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