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jQuery regExp cheat sheet

jQuery RegExp for Numbers

//select integers only
var intRegex = /[0-9 -()+]+$/;  
//match any ip address
var ipRegex = '\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b';  
//match number in range 0-255
var num0to255Regex = '^([01][0-9][0-9]|2[0-4][0-9]|25[0-5])$';
//match number in range 0-999
var num0to999Regex = '^([0-9]|[1-9][0-9]|[1-9][0-9][0-9])$';
//match ints and floats/decimals
var floatRegex = '[-+]?([0-9]*\.[0-9]+|[0-9]+)';
//Match Any number from 1 to 50 inclusive
var number1to50Regex = /(^[1-9]{1}$|^[1-4]{1}[0-9]{1}$|^50$)/gm;

jQuery RegExp for Validation

//match email address
var emailRegex = '^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$';
//match credit card numbers
var creditCardRegex = '^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$';
//match username
var usernameRegex = '/^[a-z0-9_-]{3,16}$/';
//match password
var passwordRegex = '/^[a-z0-9_-]{6,18}$/';
//Match 8 to 15 character string with at least one upper case letter, one lower case letter, and one digit (useful for passwords).
var passwordStrengthRegex = /((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,15})/gm;
//match elements that could contain a phone number
var phoneNumber = /[0-9-()+]{3,20}/;

jQuery RegExp for Dates

//MatchDate (e.g. 21/3/2006)
var dateRegex = /(\d{1,2}\/\d{1,2}\/\d{4})/gm;
//match date in format MM/DD/YYYY
var dateMMDDYYYRegex = '^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d$';
//match date in format DD/MM/YYYY
var dateDDMMYYYRegex = '^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$';

jQuery RegExp for URL’s

//match a url
var urlRegex = '/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/';
//match a url slug (letters/numbers/hypens)
var urlslugRegex = '/^[a-z0-9-]+$/';

jQuery RegExp for Vowels

//select vowels only
var vowelRegex = /^[aeiou]/;

jQuery RegExp for Whitespace

//select whitespace
var whiteSpaceRegex = '^[ \t]+';
//select whitespace and tabs
var whiteSpaceRegex = '^[ \t]+|[ \t]+$';  
//select whitespace and linebreaks
var whiteSpaceRegex = '[ \t\r\n]';  
//replace newline characters with <br /> tags
newLineToBr = function(str) { return str.replace(/(\r\n|[\r\n])/g, '<br />'); }

jQuery RegExp for Domain Names

//match domain name (with HTTP)
var domainRegex = /(.*?)[^w{3}\.]([a-zA-Z0-9]([a-zA-Z0-9\-]{0,65}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}/igm;
//match domain name (www. only)
var domainRegex = /[^w{3}\.]([a-zA-Z0-9]([a-zA-Z0-9\-]{0,65}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}/igm;
//match domain name (alternative)
var domainRegex = /(.*?)\.(com|net|org|info|coop|int|com\.au|co\.uk|org\.uk|ac\.uk|)/igm;
//match sub domains: www, dev, int, stage,,
var subDomainRegex = /(http:\/\/|https:\/\/)?(www\.|dev\.)?(int\.|stage\.)?(travel\.)?(.*)+?/igm;

jQuery RegExp for Images

//Match jpg, gif or png image 
var imageRegex = /([^\s]+(?=\.(jpg|gif|png))\.\2)/gm;
//match all images
var imgTagsRegex = /<img.+?src=\"(.*?)\".+?>/ig; 
//match just .png images

Other Useful jQuery RegExp Examples

//match RGB (color) string
var rgbRegex = /^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/;  
//match hex (color) string
var hexRegex = '/^#?([a-f0-9]{6}|[a-f0-9]{3})$/';
//Match Valid hexadecimal colour code
var hexRegex = /(#?([A-Fa-f0-9]){3}(([A-Fa-f0-9]){3})?)/gm;
//match a HTML tag (v1)
var htmlTagRegex = '/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/';
//match HTML Tags (v2)
var htmlTagRegex = /(\<(/?[^\>]+)\>)/gm;
//match /product/123456789
var productUrlRegex = '(\/product\/)?+[0-9]+';  
//Match Letters, numbers and hyphens
var lnhRegex = /([A-Za-z0-9-]+)/gm;  
//match all .js includes   
var jsTagsRegex = /<script.+?src=\"(.+?\.js(?:\?v=\d)*).+?script>/ig;  
//match all .css includes
var cssTagsRegex = /<link.+?href=\"(.+?\.css(?:\?v=\d)*).+?>/ig;


Usage example:

if (variable.match(dateRegex) == null) { ... }

else{ ... }