小程序扫描二维码，正则校验

const reg = /^DECA[A-Za-z0-9]{12}$/;

 wx.scanCode({
      success: (res) => {
        const result = res.result;
       const reg = /^DECA[A-Za-z0-9]{12}$/;
      //  const reg = /^DECA/;
        const a = reg.test(result);
        if (!a) {
          wx.showToast({
            icon: 'none',
            title: '非法二维码',
          })
        }
        wx.navigateTo({
          url: '../bind/bind?title=' + res.result
        })
      }
    })

//index.js
//获取应用实例
const app = getApp()

Page({
  data: {
    result: ''
  },

  onLoad: function () {

  },

  getScancode: function () {
    var _this = this;
    // 允许从相机和相册扫码
    wx.scanCode({
      success: (res) => {

        const result = res.result;
        const reg = /^DECA[A-Za-z0-9]{12}$/;
        const a = reg.test(result);
        if (!a) {
         wx.showToast({
            icon: 'none',
            title: '非法二维码',
          })
       
        }

        wx.navigateTo({
          url: '../bind/bind?title=' + res.result

        })

      }
    })

  }

})