正则表达式替换客户定义的特殊字符

Question

I need ac# function which will replace all special characters customized by the client from a string Example

 string value1 = @"‹¥ó׬¶ÝÆ";
 string input1 = @"Thi¥s is\123a strÆing";
 string output1 = Regex.Replace(input1, value1, "");

I want have a result like this : output1 =Thi s is\\123a str ing

Answer 1

Why do you need regex? This is more efficient, concise also readable:

string result = string.Concat(input1.Except(value1));

If you don't want to remove but replace them with a different string you can still use a similar(but not as efficient) approach:

string replacement = "[foo]";
var newChars = input1.SelectMany(c => value1.Contains(c) ? replacement : c.ToString());
string result = string.Concat( newChars ); // Thi[foo]s is\123a str[foo]ing

Answer 2

Someone asked for a regex?

string value1 = @"^\-[]‹¥ó׬¶ÝÆ";
string input1 = @"T-^\hi¥s is\123a strÆing";

// Handles ]^-\ by escaping them
string value1b = Regex.Replace(value1, @"([\]\^\-\\])", @"\$1");

// Creates a [...] regex and uses it
string input1b = Regex.Replace(input1, "[" + value1b + "]", " ");

The basic idea is to use a [...] regex. But first you have to escape some characters that have special meaning inside a [...] . They should be ]^-\\ Note that you don't need to escape the [

note that this solution isn't compatible with non-BMP unicode characters (characters that fill-up two char ) A solution that is compatible with them is more complex, but for normal use it shouldn't be a problem.