格式化电话号码

Question

如何将电话号码的格式从（###）### - ####改为##########？有没有最好的方法来做到这一点？我可以使用String.Substring来获取每个数字块，然后连接它们。但是，还有其他复杂的方法吗？

Answer 1

一个简单的正则表达式替换如何？

string formatted = Regex.Replace(phoneNumberString, "[^0-9]", ""); 

这实质上只是一个白色的数字列表。看到此小提琴：http://dotnetfiddle.net/ssdWSd

输入：（123）456-7890

输出：1234567890

Answer 2

一个简单的方法是：

myString = myString.Replace("(", ""); 
myString = myString.Replace(")", ""); 
myString = myString.Replace("-", ""); 

用一个空字符串替换每个字符。

Answer 3

尝试这种情况：

​​

REGEX说明

^\((\d+)\)(\d+)-(\d+)$ 

Assert position at the beginning of the string «^» 
Match the character “(” literally «\(» 
Match the regex below and capture its match into backreference number 1 «(\d+)» 
    Match a single character that is a “digit” (0–9 in any Unicode script) «\d+» 
     Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» 
Match the character “)” literally «\)» 
Match the regex below and capture its match into backreference number 2 «(\d+)» 
    Match a single character that is a “digit” (0–9 in any Unicode script) «\d+» 
     Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» 
Match the character “-” literally «-» 
Match the regex below and capture its match into backreference number 3 «(\d+)» 
    Match a single character that is a “digit” (0–9 in any Unicode script) «\d+» 
     Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» 
Assert position at the end of the string, or before the line break at the end of the string, if any (line feed) «$» 

$1$2$3 

Insert the text that was last matched by capturing group number 1 «$1» 
Insert the text that was last matched by capturing group number 2 «$2» 
Insert the text that was last matched by capturing group number 3 «$3» 

Answer 4

我会使用LINQ做到这一点：

var result = new String(phoneString.Where(x => Char.IsDigit(x)).ToArray()); 

虽然正则表达式也适用，这并不需要任何特殊设置。