格式化電話號碼

Question

如何將電話號碼的格式從（###）### - ####改爲##########？有沒有最好的方法來做到這一點？我可以使用String.Substring來獲取每個數字塊，然後連接它們。但是，還有其他複雜的方法嗎？

Answer 1

一個簡單的正則表達式替換如何？

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

這實質上只是一個白色的數字列表。看到此小提琴：http://dotnetfiddle.net/ssdWSd

輸入：（123）456-7890

輸出：1234567890

Answer 2

一個簡單的方法是：

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

用一個空字符串替換每個字符。

Answer 3

嘗試這種情況：

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REGEX說明

^\((\d+)\)(\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

我會使用LINQ做到這一點：

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

雖然正則表達式也適用，這並不需要任何特殊設置。