fixes validatorjs#2430 - scientific notation support

Author: OlaOluwalekan

src/lib/isNumeric.js

@@ -1,5 +1,5 @@
-import assertString from './util/assertString';
-import { decimal } from './alpha';
+import assertString from "./util/assertString";
+import { decimal } from "./alpha";
 
 const numericNoSymbols = /^[0-9]+$/;
 
@@ -8,5 +8,10 @@ export default function isNumeric(str, options) {
   if (options && options.no_symbols) {
     return numericNoSymbols.test(str);
   }
-  return (new RegExp(`^[+-]?([0-9]*[${(options || {}).locale ? decimal[options.locale] : '.'}])?[0-9]+$`)).test(str);
+
+  const decimalSymbol = (options || {}).locale ? decimal[options.locale] : ".";
+
+  return new RegExp(
+    `^[+-]?(?:\\d+|\\d*${decimalSymbol}\\d+)(?:[eE][+-]?\\d+)?$`
+  ).test(str);
 }