Question

I wrote Regex to allow only digits. It is @"[0-9]" and it works perfectly. But I would like to add a symbol “-” in regex. I want to allow digits and “-“. How to do it?)
I’ve tried such mask @"[0-9]\{-}" but it allows nothing.

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I have seen recently that if I input hyphen then my program does not understand as “hyphen”. This is a reason why your all masks did not work. Nevertheless, they are all correct. Thanks a lot for your help. Now I will find how to read hyphen as “-” in WPF 2010.

Answer 1

Hypens (-) do not act like range specifiers at the beginning of a character set, so you can do this with the regex

@"[-0-9]"

or if, like in most regex engines, WPF allows character set shorthands in character sets, you can also use

@"[-\d]"

or, as the other answers mentioned, you can escape the - to put it in the regex, as in either of these two regular expressions

@"[0-9\-]"
@"[\d\-]"