useful regex

useful regex

    var EmailRegex = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
//simple email [a-z0-9!#$%&amp;'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&amp;'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
    var FilenameRegex = /^[0-9a-zA-Z\^\&\'\£\@\;\{\}\[\]\,\”\`\’\$\=\!\-\#\(\)\.\%\+\~\_ ]+$/;
    var URLRegex = /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;
    var TelRegex = /^(?:(?:\(?(?:00|\+)([1-4]\d\d|[1-9]\d?)\)?)?[\-\.\ \\\/]?)?((?:\(?\d{1,}\)?[\-\.\ \\\/]?){0,})(?:[\-\.\ \\\/]?(?:#|ext\.?|extension|x)[\-\.\ \\\/]?(\d+))?$/i;
    //simple Tel ^([0-9\(\)\/\+ \-]*)$

var EmailRegex = /^[a-z0-9!#$%&'+/=?^{|}~-]+(?:.[a-z0-9!#$%&'_+/=?^_{|}~-]+)*@(?:a-z0-9?.)+(a-z0-9){1,63}?/;

even simpler email: /^.+@.+..+$/

to include case insensitive and cater for ending with dot:
/^[a-z0-9!#$%&'+/=?^{|}~-]+(?:.[a-z0-9!#$%&'_+/=?^_{|}~-]+)*@(?:a-z0-9?.)+(a-z0-9){1,63}?$/i

on HTML5:
[aA-zZ0-9!#$%&'+/=?^{|}~-]+(?:.[aA-zZ0-9!#$%&'_+/=?^_{|}~-]+)*@(?:aA-zZ0-9?.)+(aA-zZ0-9){1,63}?