Question

Tried using the following regex code but the – key cant be accepted into my input textbox. Please assist!

My code is as followed:

if (Regex.IsMatch(textBox_address.Text, @"^[a-zA-Z0-9#- ]+$"))

Answer 1

Escape the - by replacing it by \-:

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

As you may see in this expression the [.-.] if used to define a set of characters. To explain the regex parser, that your character has not this meaning use \ to escape it.

It would be the same thing if you want to a regex that matches only numbers and [.
To do it : ^[0-9\[]+$ otherwise the regex can’t be parsed.