Remove area code from Telephonenumber

Question

How to remove coutrycode from telphonumber.

number may come in this format.

4770300000
004770300000
[phone]
4670300000

I would like to remove the country codes so that they are matched against the number against.

070300000

Answer 1

The following should replace any valid country code (starting with "00" or "+") with a leading zero.

resultString = Regex.Replace(subjectString, @"^(00|\+)(1|2[078]|2[1234569][0-9]|3[0123469]|3[578][0-9]|4[013456789]|42[0-9]|5[09][0-9]|5[12345678]|6[0123456]|6[789][0-9]|7|8[0578][0-9]|8[123469]|9[0123458]|9[679][0-9])", "0");

Answer 2

It's complicated. Both country codes and national numbers vary in length. In addition, there are regional codes that some countries use and some do not. And then there are optional leading "+" or "00". Not to mention the number of emergency services.

; ! - . .

. , :

PhoneNumberUtil.GetInstance().Parse(phoneno, "").NationalNumber

Answer 3

? (, 47 46):

resultString = Regex.Replace(subjectString, @"(\+|\b00|\b)4[67]", "0");

4770300000 004770300000 [phone] 4670300000

070300000 070300000 070300000 070300000

, , , 47 46. , lookahead, , 8 ( - ) .

So

resultString = Regex.Replace(subjectString, @"(\+|\b00|\b)4[67](?=\d{8})", "0");

4770300000 004770300000 [phone] 460000

070300000 070300000 070300000 460000

( , - ),

resultString = Regex.Replace(subjectString, @"^(\+|00)4[67](?=\d{8})", "0");

. !

Answer 4

070300000 , , f.e. 9