Validating stuff in JS

validate.js

window.validate = window.validate || {};

window.validate.date = function (raw) {
  var date, parsed;

  date = raw.split(/[\D]+/);

  if (date.length !== 3 || date[0].length > 2 || date[1].length > 2 || (date[2].length !== 2 && date[2].length !== 4)) {
    return false;
  }

  date[0] = (date[0].length === 1) ? '0' + date[0] : date[0];
  date[1] = (date[1].length === 1) ? '0' + date[1] : date[1];
  date[2] = (date[2].length === 2) ? '19' + date[2] : date[2];

  if (!!window.moment) {
    parsed = window.moment([parseInt(date[2], 10), parseInt(date[1], 10), parseInt(date[0], 10)]);

    if (!parsed.isValid() && parsed.diff(window.moment(), 'years') > -3 && parsed.diff(window.moment(), 'years') < -100) {
      return false;
    }
  }

  date = date.join('/');

  if (!date.match(/^[\d]{2}\/[\d]{2}\/[\d]{4}$/)) {
    return false;
  }

  return date;
};

window.validate.email = function (email) {
  if (!!email.toString().match(/^[^@^\s]+@[^@^\s]+\.[^@]+$/)) {
    return email.toLowerCase().replace(/\s+/gi, '');
  }

  return false;
};

window.validate.phone = function (phone) {
  phone = phone.replace(/\s+/gi, '');

  if (phone.length === 0) {
    return false;
  }

  if (phone.length < 6) {
    return false;
  }

  // Formatting
  // 1. Replace all separators with spaces
  tel = tel.replace(/[^\d\+\(\)]+/gi, ' ');

  // 2. Replace +32(0)34 with +32 (0) 34 (note the space)
  tel = tel.replace(/(\S)(\()/, '$1 (');
  tel = tel.replace(/(\))(\S)/, ') $2');

  if (tel[0] === '0') {
    return tel;
  } else if (tel[0] === '+') {
    // Formatting: replace +32479 with +32 479 (note the space)
    return tel.replace(/^(\+[\d]{2})(\S)/, '$1 $2');
  }

  return false;
};