Remove numbers and characters only from string

Question

Given a string containing numbers and characters eg

Mi2ch£al

What would be the relevant regex to remove everything but letters (therefore numbers and characters)?

Also, I am using .NET 2.0 for this task.

Answer 1

string s = "Mi2ch£al";
s = Regex.Replace(s, @"[^\w\s]", "");

and if you don't want international accented characters:

string s = "Mi2ch£al";
s = Regex.Replace(s, @"[^a-zA-Z0-9\s]", "");

Answer 2

用空字符串或[^a-zA-Z\\s]替换正则表达式[^a-zA-Z] [^a-zA-Z\\s]可以节省空间

Answer 3

如果您不介意使用Linq：

string s = new string("Mi2ch£al".Where(c => !char.IsNumber(c) && !char.IsLetter(c)).ToArray());

Answer 4

\\p{L} matches any character that is a letter, and \\P{L} any character that is not a letter (including non-Latin character sets, accented characters, etc.). Thus, you could simply use:

Regex.Replace(input, @"\P{L}", String.Empty)

where input is the input string.