08_execMyTry.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
  </head>
  <body>
    <script>
      var matches = /hello (\S+)/.exec('this is hello world!')
      // ["hello world!", "world!", index: 8, input: "this is hello world!"]
      console.log(matches)

      // exec 如果没有匹配到返回null，不管正则表达式中有没有g修饰符，都会返回相同的数组
      // ["hello world!", "world!", index: 8, input: "this is hello world! hello hahaha"]
      var matches2 = /hello (\S+)/.exec('this is hello world! hello hahaha')
      console.log(matches2)
    </script>
  </body>
</html>