如何從多行字符串中刪除最后一個字符？

Question

示例： 考慮如下的字符串：

String a="This line1 has a,b,c,\nThis line2 has d,e,f, \nThis line3 has g,h,i";
System.out.println(a);

輸出：

This line1 has a,b,c,                 
This line2 has d,e,f,                        
This line3 has g,h,i

由於這是一個多行字符串，我如何能夠從輸出中刪除每行最后出現的逗號並打印輸出，如下所述？

This line1 has a,b,c                
This line2 has d,e,f                        
This line3 has g,h,i

Answer 1

你可以使用正則表達式：

String output = a.replaceAll(",\\s*\n", "\n");

它將替換逗號的任何序列，0或更多空格以及僅帶換行符的換行符。