# 2. 正则表达式必知必会-匹配单个字符

const str = 'Hello my name is wendy. My website is https://github.com/lwl0812/wendys-site.';
const reg = /wendy/g;
let match;
while ((match = reg.exec(str))) {
  console.log(match[0], match.index);
}
// wendy 17
// wendy 65

const str =
  'sales1.xls\n' +
  'orders3.xls\n' +
  'sales2.xls\n' +
  'sales3.xls\n' +
  'apac1.xls\n' +
  'europe2.xls\n' +
  'na1.xls\n' +
  'na2.xls\n' +
  'sa1.xls';
const reg = /sales./g;
let match;
while ((match = reg.exec(str))) {
  console.log(match[0]);
}
// sales1
// sales2
// sales3

const str =
  'sales1.xls\n' +
  'orders3.xls\n' +
  'sales2.xls\n' +
  'sales3.xls\n' +
  'apac1.xls\n' +
  'europe2.xls\n' +
  'na1.xls\n' +
  'na2.xls\n' +
  'sa1.xls';
const reg = /.a./g;
let match;
while ((match = reg.exec(str))) {
  console.log(match[0]);
}
// sal 匹配三次
// pac
// na1
// na2
// sa1

const str =
  'sales1.xls\n' +
  'orders3.xls\n' +
  'sales2.xls\n' +
  'sales3.xls\n' +
  'apac1.xls\n' +
  'europe2.xls\n' +
  'na1.xls\n' +
  'na2.xls\n' +
  'sa1.xls';
const reg = /.a.\.xls/g;
let match;
while ((match = reg.exec(str))) {
  console.log(match[0]);
}
// na1.xls
// na2.xls
// sa1.xls