正则表达式取代某些条件

Question

如何更换

convert(varchar,CREATED_ON,106)  =>  to_char(CREATED_ON, 'dd/mon/yyyy') 

类似于以下代码

string ss = Regex.Replace("convert(varchar,CREATED_ON,106)", @"convert(varchar,^[a-zA-Z][a-zA-Z0-9]*$,106)", "to_char(CREATED_ON, 'dd/mon/yyyy')", RegexOptions.IgnoreCase);

我该怎么做？

Answer 1

这样的事情？

class Program
{
    static void Main(string[] args)
    {
        Regex reg = new Regex(@"convert\(\s?varchar\s?,(.*?)\s?,\s?106\s?\)",RegexOptions.IgnoreCase);
        string original = "convert(varchar,CREATED_ON,106)";

        string replaced = reg.Replace(original, "to_char($1, 'dd/mon/yyyy')");

        Console.WriteLine(replaced);
    }
}

或不使用静态方法创建正则表达式：

string ss = Regex.Replace(original, @"convert\(\s?varchar\s?,(.*?)\s?,\s?106\s?\)", "to_char($1, 'dd/mon/yyyy')", RegexOptions.IgnoreCase);

$ 1将被第一组（。*？）中的whats取代。