前端从入门到入坟（正则）

let reg = /5$/i let str = '18951964652' console.log(reg.test(str));

    let reg = new RegExp('(您好|你好）','i')
    let reg = /^(您好|你好|holle)/i
    let str ='js 好的'
    console.log(reg.test(str));
    
    let reg = /^(\.|\[|\]|\{|\}|\|)$/i
    let str = '['
    console.log(reg.test(str));
    let reg = /^(11|33|44){6}$/i
    let str = '111111111111'
    console.log(reg.test(str));
    

   let reg = /^[a-zA-Z]{1,5}$/i
   let str = '183asddfsg'
   console.log(reg.test(str));
   

  let reg = /^\w{0,20}@\w{0,10}\.(com|net|cn|org)$/
  let str = 'zzz@qq.com'
  console.log(reg.test(str));
  


    let reg = /^[186]{6}$/i
    let str = '456446'
    console.log(reg.test(str));