如何从多行字符串中删除最后一个字符？

Question

示例: 考虑如下的字符串:

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

输出:

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

由于这是一个多行字符串,我如何能够从输出中删除每行最后出现的逗号并打印输出,如下所述？

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

Answer 1

你可以使用正则表达式:

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

它将替换逗号的任何序列,0或更多空格以及仅带换行符的换行符.