JS-Regex.js

// RegEx Patterns

// get all white space
let allwhitespace = /(\s+)/ug;

// Numbers only
let numbersregex = /^[0-9]*$/;
// or
let numbersregex = /^\d*$/;

// Float like 123.00
let floatregex = /^([1-9]*[.])00$/;

// 10 digits mobile number (only numbers)
// You can change length
let mobileregex = /^\d{10}$/;

// Alphabets only small letters
let smAlphabetregex = /^[a-z]*$/;

// Alphabets only capital letters
let capAlphabetregex = /^[A-Z]*$/;

// Alphabets only capital and small letters
let scAlphabetregex = /^[a-zA-Z]*$/;

// Alphanumeric only with capital and small letters
let numAlphabetregex = /^[\da-zA-Z]*$/;

// Username alphanumeric with '_' and 4-8 chars
// You can edit username length by changing number 4(min) & 8(max)
let usernameregex = /^([a-zA-Z\d_]){4,8}$/;

// or (i- case insensitive)
let iUsernameregex = /^([a-z\d_]){4,8}$/i;

// Full Name (with first & last name)
let fullnameregex = /^[a-zA-z]{2,20}[ ][a-zA-z]{3,20}$/i;

// Full Name (with first & middle & last name)
let fullmnameregex = /^[a-zA-z]{3,}[ ][a-zA-z]{3,}[ ][a-zA-z]{3,}$/i;

// Full Name (middle name optional)
let middlenameregex = /^[a-zA-z]{3,}[ ][a-zA-z]{3,}([ ][a-zA-z]{3,})?$/i;

// Normal Email 
let emailregex = /^\w+([\.-]?\w+)@\w+([-]?\w+)\.([a-z]{2,3})(\.[a-z]{2,3})?$/;

// Standard Email
let semailregex = /^\w+([\.-]?\w+)@\w+([-]?\w+)\.([a-z]{2,12})(\.[a-z]{2,12}){0,1}?$/;

// Web URL
// Ex. example.com or example.co.in, www.example.com, http://example.com, http://www.example.com
let urlregex = /^(http[s]?:\/\/)?(www\.)?[a-zA-Z0-9]+([-]?\w+)\.([a-z]{2,12})(\.[a-z]{2,12})?$/;