使用正则表达式规范化电话号码

Question

I have a list of phone numbers entered by users without validation and they look like:

 - 495) 995-0595
 - 105-6439
 - 095 268 8621
 - 324-51-44
 - 7 (495) 995-05-95
 - 7 495 995 05 95
 - 7 (495) 995-0595
 - +7 (495) 995-05-95
 - 7 (495)925-34-89
 - 7(495)9253489
 - 7(495)925-34-89
 - 74959950595

I want to convert these numbers into this (Russian) format: +X (XXX) XXX-XX-XX

Is there any chance here to achieve it using regular expressions?

Answer 1

Yup, Extract & Reformat!

List<string> oldlist = new List<string>();
List<string> newlist = new List<string>();
foreach(string s in oldlist)
{
     if(s.Contains('(')) s = s.Replace('('), "");//etc
     newlist.Add(numFormat(s));
}

string prefix = "495";

string numFormat(string s)
{
     string my;
     if(s.Length == 7)
     {
         my = string.Format("+7 ({0}) {1} {2} {3}", prefix, s.substring(0,3), s.subtring(3,2), s.substring(5,2);
     }
     else if(s.length == 10)
     {
         my = string.Format("+7 ({0}) {1} {2} {3}", s.substring(0,3), s.substring(3,3), s.subtring(5,2), s.substring(7,2);        
     }
     //etc
     return my;
}

This is just off the top of my head... but you get the idea

Answer 2

Run your list through this:

var strippedNumbers = new List<string>();
foreach (var num in listOfRussianNumbers.Select(x=>Regex.Replace(x, "[^0-9]", ""))) 
    strippedNumbers.Add(num.Length == 7?"7499"+num:num);

Then use string.Format to print it out how you want

string.Format("+{0} ({1}) {2}-{3}-{4}", 
    num.Substring(0,1), 
    num.Substring(1,3),
num.Substring(4,3),
num.Substring(7,2),
num.Substring(9,2));

Answer 3

I think you should do this

1. Convert it to string.
2. Using Loop remove anything that does not look like number. You can use Char.IsDigit() for this.
3. Then do your desired formatting using string.Substring() .

Make sure you do all these steps in string format only.

Like

string str = "495) 995-0595";
List<char> digits = new List<char>();

for (int i = 0; i < str.Length; i++)
{
    if(char.IsDigit(str[i]))
        digits.Add(str[i]);
}

str = new string(digits.ToArray());

str = "+" + str.Substring(0, 1) + " (" + str.Substring(1, 3) + ") " 
      + str.Substring(4, 2) + "-" + str.Substring(6, 2) + "-" + str.Substring(8);

This returned me "+4 (959) 95-05-95"

Answer 4

This is the best I can get in short notice.

((\+?\d)\s?)?\(?(\d\d\d)\)?\s?(\d\d\d)(\s|-)?(\d\d)(\s|-)?(\d\d)

This will select the bolded from your sample.

495) 995-0595
105-6439
095 268 8621
324-51-44
7 (495) 995-05-95
7 495 995 05 95
7 (495) 995-0595
+7 (495) 995-05-95
7 (495)925-34-89
7(495)9253489
7(495)925-34-89
74959950595

On the strings that dont match, you can send them through a different routine or for manual processing.

Answer 5

Something like that:

(\d)? ?\(?(\d\d\d)?\)? *?(\d\d\d) *?-? *?(\d\d) *?-? *?(\d\d)