替换正则怎么写

Question

var aaa = aaa.a
var bbb = bbb.b
怎么写个正则 替换掉.a 或者 .b 得到结果 aaa和bbb
aaa.replace(正则，‘’)
bbb.replace(正则，‘’)
这个正则怎么写

Answer 1

用分隔方法呀，aaa.spilt(".")[0]

Answer 2

  var str = 'aaa.a';
  var pattern = /\.[a-z]*/g;
  var a = str.replace(pattern, '');
  console.log(a); // aaa

Answer 3

sed s/aaa.a/aaa/g

Answer 4

\.\w*
\.\w*

Answer 5

var str = 'aaa.a';
str = str.replace(/(?<=\w+)(\.\w)/g, '');