学习记录——正则表达式

 let reg = new RegExp("(美国|日本)",'i')

let reg = /^(美国|日本)/i

let str = '你好'

console.log(reg.test(str));

let reg = /^张/i

let str = '张飞'

console.log(reg.test(str));

let reg = /(199)(489)/i

let str = '19988890439489'

console.log(reg.test(str));

let reg = /^(\.|\[|\]|\{|\}|\|)$/i

let str = '['

console.log(reg.test(str));

let reg= /^[a-zA-Z]{1,5}$/i

let reg= /^[a-zA-Z]{2,}$/i

let reg= /^[a-zA-Z]?$/i //{0,1}

let reg= /^183[a-zA-Z]*$/i //{0,}

let reg= /^183[a-zA-Z]+$/i //{1,}

let str = '183asdfasfas'

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));