正则表达式拼接变量到表达式当中

    data() {
      return {
        reg: /([1-9]\d{0,14}\.\d{0,2})|(0\.\d{0,2})|([1-9]\d{0,14})|(0\.?)/,
        money: 0,
        oldValue: 0,
        moneyStr: "",
      }
    },
    props: {
      jsonData: {
        required: true,
      },
      keyName: {
        required: false,
        default: "value"
      },
      roundNumberLength: {
        required: false,
        type: Number,
        default: 14
      }
    },

想在 created中把两个14换成roundNumberLength这个父组件传过来的变量，字符串应该怎么拼接。麻烦给举个例子。谢谢。new RegExp(),可以。别的方式也可以。谢谢

new RegExp("([1-9]\\d{0,"+roundNumberLength+"}\\.\\d{0,2})|(0\\.\\d{0,2})|([1-9]\\d{0,"+roundNumberLength+"})|(0\\.?)")

注意在拼接字符串时要确保变量已经被赋值