从格式化的字符串中提取电话号码正则表达式

Question

Given the phone numbers are all on this format:

(999) 999-9999 Ext.9999"

I want to return everything to the second space, eg:

(999) 999-9999

Any ideas?

Answer 1

if your string is in s:

   string s = "(999) 999-9999 Ext.9999";
   string number = s.Split(" Ext")[0];

Answer 2

If you want a perfect match, you can use this expression:

string s = "(999) 999-9999 Ext.9999";
Match m = Regex.Match(s, @"(?<nr>\([0-9]{3}\)\s+[0-9]{3}\-[0-9]{4})");
if (m.Groups["nr"].Success)
{
    Console.WriteLine(m.Groups["nr"].Value);
}

Answer 3

Don't use a regular expression. Use Split() . Then concatenate the first two elements back together.

Answer 4

Where s contains the full sting. If truely "all on this format" exactly , then you could just take the first 14 characters:

string number = s.SubString(0, 14);

Or a bit more flexible, and safer:

var idx = s.IndexOf(" Ext");
//good idea to check if idx == -1
string number = s.SubString(0, idx);

Answer 5

Check out this one:

    string s = "(999) 999-9999 Ext.9999";
    string phonenumber1 = Regex.Replace(s, @"(?i)\s*ext\.\d+", "");