Optimized RegEx to exclude reserved series

src/lib/isAbaRouting.js

@@ -1,18 +1,15 @@
 import assertString from './util/assertString';
 
 // http://www.brainjar.com/js/validation/
-const isRoutingReg = /^[0-9]{9}$/;
-
-// series reserved for future use
 // https://www.aba.com/news-research/research-analysis/routing-number-policy-procedures
-const isReservedReg = /^(1[3-9])|(20)|(3[3-9])|(4[0-9])|(5[0-9])|(60)|(7[3-9])|((8[1-9])|(9[0-2]))|(9[3-9])$/;
+// series reserved for future use are excluded
+const isRoutingReg = /^(?!(1[3-9])|(20)|(3[3-9])|(4[0-9])|(5[0-9])|(60)|(7[3-9])|(8[1-9])|(9[0-2])|(9[3-9]))[0-9]{9}$/;
 
 export default function isAbaRouting(str) {
   assertString(str);
   str = str.trim();
 
   if (!isRoutingReg.test(str)) return false;
-  if (isReservedReg.test(str.slice(0, 2))) return false;
 
   let checkSumVal = 0;
   for (let i = 0; i < str.length; i++) {