JavaScript RegEx

regex.js

//file ext
(/\.(gif|jpg|jpeg|tiff|png)$/i).test(filename)
//match numbers
var regex = new RegExp("\\+?\\(?\\d*\\)? ?\\(?\\d+\\)?\\d*([\\s./-]?\\d{2,})+", "g")
    ,string = "testing testing one 800-999-9999"
    ,arr = string.match(regex);

//remove numbers from string => format

var string = "diplomat 999-555-5555";
str = string.replace(/[^\d.]/g, "");
console.log(str);


var regexObj = /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;
var formattedNumber = "";

if (regexObj.test(str)) {
    formattedNumber =
        str.replace(regexObj, "($1) $2-$3");
} else {
    // Invalid phone number
}