isRFC3339: Format implementation closer to spec for clarity

lib/isRFC3339.js

@@ -11,9 +11,26 @@ var _assertString2 = _interopRequireDefault(_assertString);
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
-/* eslint-disable max-len */
-var rfc3339 = /^[0-9]{4}-(0[1-9]|1[0-2])-([12]\d|0[1-9]|3[01])[ tT]([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?([zZ]|[-+]([01][0-9]|2[0-3]):[0-5][0-9])$/;
-/* eslint-enable max-len */
+/* Based on https://tools.ietf.org/html/rfc3339#section-5.6 */
+
+var dateFullYear = /[0-9]{4}/;
+var dateMonth = /(0[1-9]|1[0-2])/;
+var dateMDay = /([12]\d|0[1-9]|3[01])/;
+
+var timeHour = /([01][0-9]|2[0-3])/;
+var timeMinute = /[0-5][0-9]/;
+var timeSecond = /([0-5][0-9]|60)/;
+
+var timeSecFrac = /(\.[0-9]+)?/;
+var timeNumOffset = new RegExp('[-+]' + timeHour.source + ':' + timeMinute.source);
+var timeOffset = new RegExp('([zZ]|' + timeNumOffset.source + ')');
+
+var partialTime = new RegExp(timeHour.source + ':' + timeMinute.source + ':' + timeSecond.source + timeSecFrac.source);
+
+var fullDate = new RegExp(dateFullYear.source + '-' + dateMonth.source + '-' + dateMDay.source);
+var fullTime = new RegExp('' + partialTime.source + timeOffset.source);
+
+var rfc3339 = new RegExp(fullDate.source + '[ tT]' + fullTime.source);
 
 function isRFC3339(str) {
   (0, _assertString2.default)(str);

src/lib/isRFC3339.js

@@ -1,8 +1,25 @@
 import assertString from './util/assertString';
 
-/* eslint-disable max-len */
-const rfc3339 = /^[0-9]{4}-(0[1-9]|1[0-2])-([12]\d|0[1-9]|3[01])[ tT]([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?([zZ]|[-+]([01][0-9]|2[0-3]):[0-5][0-9])$/;
-/* eslint-enable max-len */
+/* Based on https://tools.ietf.org/html/rfc3339#section-5.6 */
+
+const dateFullYear = /[0-9]{4}/;
+const dateMonth = /(0[1-9]|1[0-2])/;
+const dateMDay = /([12]\d|0[1-9]|3[01])/;
+
+const timeHour = /([01][0-9]|2[0-3])/;
+const timeMinute = /[0-5][0-9]/;
+const timeSecond = /([0-5][0-9]|60)/;
+
+const timeSecFrac = /(\.[0-9]+)?/;
+const timeNumOffset = new RegExp(`[-+]${timeHour.source}:${timeMinute.source}`);
+const timeOffset = new RegExp(`([zZ]|${timeNumOffset.source})`);
+
+const partialTime = new RegExp(`${timeHour.source}:${timeMinute.source}:${timeSecond.source}${timeSecFrac.source}`);
+
+const fullDate = new RegExp(`${dateFullYear.source}-${dateMonth.source}-${dateMDay.source}`);
+const fullTime = new RegExp(`${partialTime.source}${timeOffset.source}`);
+
+const rfc3339 = new RegExp(`${fullDate.source}[ tT]${fullTime.source}`);
 
 export default function isRFC3339(str) {
   assertString(str);

validator.js

@@ -1139,9 +1139,26 @@ function isISO8601(str) {
   return iso8601.test(str);
 }
 
-/* eslint-disable max-len */
-var rfc3339 = /^[0-9]{4}-(0[1-9]|1[0-2])-([12]\d|0[1-9]|3[01])[ tT]([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?([zZ]|[-+]([01][0-9]|2[0-3]):[0-5][0-9])$/;
-/* eslint-enable max-len */
+/* Based on https://tools.ietf.org/html/rfc3339#section-5.6 */
+
+var dateFullYear = /[0-9]{4}/;
+var dateMonth = /(0[1-9]|1[0-2])/;
+var dateMDay = /([12]\d|0[1-9]|3[01])/;
+
+var timeHour = /([01][0-9]|2[0-3])/;
+var timeMinute = /[0-5][0-9]/;
+var timeSecond = /([0-5][0-9]|60)/;
+
+var timeSecFrac = /(\.[0-9]+)?/;
+var timeNumOffset = new RegExp('[-+]' + timeHour.source + ':' + timeMinute.source);
+var timeOffset = new RegExp('([zZ]|' + timeNumOffset.source + ')');
+
+var partialTime = new RegExp(timeHour.source + ':' + timeMinute.source + ':' + timeSecond.source + timeSecFrac.source);
+
+var fullDate = new RegExp(dateFullYear.source + '-' + dateMonth.source + '-' + dateMDay.source);
+var fullTime = new RegExp('' + partialTime.source + timeOffset.source);
+
+var rfc3339 = new RegExp(fullDate.source + '[ tT]' + fullTime.source);
 
 function isRFC3339(str) {
   assertString(str);