常用正则表达式

let regex = /^1[34578]\d{9}$/g;

 let regex = /^[a-zA-Z\$][a-zA-Z0-9_\$]{4,16}$/;

 let regex = /^[1-9][0-9]{4,10}$/g;

let regex = /^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/;

let regex = /#([0-9a-fA-F]{6}|[0-9a-fA-F]{3})/g;

let regex = /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;

let regex = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

//正数正则
let posPattern = /^\d*\.?\d+$/;
//负数正则
let negPattern = /^-\d*\.?\d+$/;
//数字正则
let numPattern = /^-?\d*\.?\d+$/;

let cPattern = /^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领A-Z]{1}[A-Z]{1}[A-Z0-9]{4}[A-Z0-9挂学警港澳]{1}$/;

let urlP= /^((https?|ftp|file):\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;