ReplaceFirst正則表達式

Question

比方說，我有一個字符串

String link = "www.thisisalink.com/tick1=@tick1@&tick2=@tick2@&tick3=@tick3@&tick4=@tick4@"; 

那麼我可以用

link = replaceFirst("(.+)=@\\1@", ""); 

爲了讓

link = "www.thisisalink.com/&tick2=@tick2@&tick3=@tick3@&tick4=@tick4@"; 

但我想循環雖然字符串，獲取已被替換的內容並將其保存到其他位置，如鏈接列表或數組...結果將爲：

String[] result = ["tick1=@tick1@", "tick2=@tick2@", "tick3=@tick3@", "tick4=@tick4@"]; 
String link = "www.thisisalink.com/&&&"; 

但我該怎麼做？我試着循環使用

while (link.matches("(.+)=@\\1@")){} 

哪個沒有用。

Answer 1

您可以使用PatternMatcher類遍歷字符串來查找將匹配您的正則表達式的子字符串。然後要替換建立的子字符串，您可以使用appednReplacement和appendTail。要建立匹配，您可以使用匹配實例中的group()。

下面是類似的東西你想要什麼

String link = "www.thisisalink.com/tick1=@tick1@&tick2=@tick2@&tick3=@tick3@&tick4=@tick4@"; 

StringBuffer sb = new StringBuffer(); 

Pattern p = Pattern.compile("(.+)=@\\1@"); 
Matcher m = p.matcher(link); 
List<String> replaced = new ArrayList<>(); 

while (m.find()) { 
    m.appendReplacement(sb, ""); 
    replaced.add(m.group()); 
} 
m.appendTail(sb); 
//to replace link with String stored in sb use link=sb.toString(); 
//otherwise link will be unchanged 
System.out.println(sb); 
System.out.println(replaced); 

輸出：

www.thisisalink.com/&&& 
[tick1=@tick1@, tick2=@tick2@, tick3=@tick3@, tick4=@tick4@] 

Answer 2

這將產生你想要的字符串：

public static void main(String[] args) 
{ 
    final String link = "www.thisisalink.com/tick1=@tick1@&tick2=@tick2@&tick3=@tick3@&tick4=@tick4@"; 
    final int index = link.indexOf("/") + 1; 

    final String[] result = link.substring(index).split("&"); 
    final String newLink = link.substring(0, index) + repeat("&", result.length -1); 
    System.out.println(newLink); 
    for(final String tick : result) 
    { 
     System.out.println(tick); 
    } 
} 

private static String repeat(final String toRepeat, final int repetitions) 
{ 
    final StringBuilder sb = new StringBuilder(repetitions); 
    for(int i = 0; i < repetitions; i++) 
    { 
     sb.append(toRepeat); 
    } 
    return sb.toString(); 
} 

產地：

www.thisisalink.com/&&& 
tick1=@tick1@ 
tick2=@tick2@ 
tick3=@tick3@ 
tick4=@tick4@