替换字符串中的字符（双引号内的值除外）

Question

我想用空白替换字符数组，除了字符串中双引号内的值。

例子

"India & China" relationship & future development

在上面的示例中，我需要替换&，但它不在任何双引号（""）内。预期结果应该是

结果

"India & China" relationship  future development

字符串的其他示例

relationship & future development "India & China" // Output: relationship  future development "India & China"

"relationship & future development India & China // Output: reflect the same input string as result string when the double quote is unclosed.

到目前为止，我已经完成了以下逻辑来替换字符串中的字符。

代码

string invalidchars = "()*&;<>";
Regex rx = new Regex("[" + invalidchars + "]", RegexOptions.CultureInvariant);
string srctxtaftrep = rx.Replace(InvalidTxt, " ");

RegexOptions options = RegexOptions.None;
Regex regex = new Regex(@"[ ]{2,}", options);
srctxtaftrep = regex.Replace(srctxtaftrep, @" ");
InvalidTxt = srctxtaftrep;

Answer 1

这是一种使用应该有效的非正则表达式方法StringBuilder：

string input = "\"India & China\" relationship & future development";
HashSet<char> invalidchars = new HashSet<char>("()*&;<>");
StringBuilder sb = new StringBuilder();
bool inQuotes = false;
foreach(char c in input)
{
    if(c == '"') inQuotes = !inQuotes;
    if ((inQuotes && c != '"') || !invalidchars.Contains(c))
        sb.Append(c);
}
string output = sb.ToString();