Regex for alphanumeric and the + character

Question

Hi,

I need a regex that allows only alphanumeric plus the + and - character.

Right now I am using:

[^\w-]

Answer 1

Try this :

[a-zA-Z0-9+\-]

Answer 2

You have to escape the - char: [\w\-+] for single character and [\w\-+]+ for more.

Answer 3

[a-zA-Z0-9\+\-]

Answer 4

This regular expression will match only if you test it against a string that has alphanumeric characters and/or +/-:

^[a-zA-Z0-9\-+]+$

To use it:

if (Regex.IsMatch(input, @"^[a-zA-Z0-9\-+]+$"))
{
    // String only contains the characters you want.
}

Answer 5

Matches single -, + or alpha-numeric:

[-+a-zA-Z0-9]

Matches any number of -, + or alpha-numeric:

[-+a-zA-Z0-9]*

Matches a string/line of just -, + or alpha-numeric:

^[-+a-zA-Z0-9]*$

Answer 6

The following pattern will match strings that contain only letters, digits, '+' or '-', including international characters such as 'å' or 'ö' (and excluding the '_' character that is included in '\w'):

^[-+\p{L}\p{N}]+$

Examples:

string pattern = @"^[-+\p{L}\p{N}]+$";
Regex.IsMatch("abc", pattern); // returns true
Regex.IsMatch("abc123", pattern); // returns true
Regex.IsMatch("abc123+-", pattern); // returns true
Regex.IsMatch("abc123+-åäö", pattern); // returns true
Regex.IsMatch("abc123_", pattern); // returns false
Regex.IsMatch("abc123+-?", pattern); // returns false
Regex.IsMatch("abc123+-|", pattern); // returns false