C# reg express: how to remove parentheses from a number

Asked Oct 09 '18 at 07:16

Active Oct 09 '18 at 07:16

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I need to remove parentheses from a phone number as below. But with following code I can only remove spaces. How can I improve this method to clean the phone string from all other possible chars?

Cheers

 string phone = "(123)234 5566"; //(+954)123 3456
 string phone = prep_numbers(@"/[^0-9]/", "", phone);

 public static string prep_numbers(string pattern, string replacement, string subject)
    {
        string str = Regex.Replace(subject, pattern, replacement);
        str = str.Replace(" ", String.Empty);
        return str;
    }

asked Oct 09 '18 at 07:16

Roshan Ruzaik

Use `prep_numbers("[^0-9]", "", phone);` ([demo](https://ideone.com/LL5rlP)). C# regex notation does not support regex delimiters, `/` are part of the pattern in your regex. – Wiktor Stribiżew Oct 09 '18 at 07:19
`Regex.Replace(phone, "[^0-9]", "")` – Paweł Dyl Oct 09 '18 at 07:22
`phone = string.Concat(phone.Where(c => c >= '0' && c <= '9'));` – Dmitry Bychenko Oct 09 '18 at 07:29
Thank you @WiktorStribiżew and Pawel this is perfectly working. – Roshan Ruzaik Oct 09 '18 at 07:32

C# reg express: how to remove parentheses from a number

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