Question

下面的代码工作正常，如果我正在代码中对模式进行硬编码，如果我从数据库中获取了该模式，那么它将无法正常工作。谁能告诉我我做错了什么

//This line works                    
string regularExpressionPattern =  @"\[(.*?)\]";;

//But this line when im fetching this from database as i have stored the pattern in it, it doesnt work. I'm assigning it the same value as above but this time from database
   string regularExpressionPattern = regExPattern.ToString();

                    string inputText = p.Text.ToString();
                    Regex re = new Regex(regularExpressionPattern);
                    foreach (Match m in re.Matches(inputText))
                    {
                        Response.Write("Match Found");
                    }

Answer 1

如果将模式存储为字符串，则可能需要将其恢复为正确的模式样式。这取决于您如何在db中存储该模式。

    function getRegFromString(string){
    var a = string.split("/");
    modifiers= a.pop(); a.shift();
    pattern = a.join("/");
    return new RegExp(pattern, modifiers);
    }
    getRegFromString(regExPattern);

在此处查看更多信息：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/toString

动态分配正则表达式模式

1 个答案: