How would I go about in replacing every character in a string which are not the following: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.@-

with -

So for example, the name Danny D'vito would become DannyD-vito

My inital though was converting string to char[] and looping through and checking each character, then convert back to string. But my hunch is telling me there must be an easier way to do this

CodePudding user response：

Regex.Replace() approach

string input = "Danny D'vito";
string result = new Regex("[^a-zA-Z0-9_.@-]").Replace(input, "-");

CodePudding user response：

You could use LINQ:

string valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.@-";
string text = "Danny D'vito";
string result = string.Concat(text.Select(c => valid.Contains(c) ? c : '-'));

String.Concat is using a StringBuilder, so this is efficient.