Check if there is phone number in string C#

Question

I read a string that includes all types of characters. I want to check whether there is in the string, consisting of sub-string at least 7 digits. What is the best way to do it?

Answer 1

use a regular expression

[0-9]{7,}

bool includesPhone = Regex.IsMatch("phone number 123456789", "[0-9]{7,}");

Answer 2

Use Regex - something like \d{7,}