feat: Add scientific notation support to isNumeric validator

- Updated the `isNumeric` function to handle scientific notation values.
- Modified the regular expression to account for both positive and negative exponents, using `e` or `E`.
- Introduced an option to handle locales with different decimal separators.
- Preserved backward compatibility by ensuring that the `no_symbols` option continues to function correctly.
- This change ensures that inputs like `1e5`, `1.23E-5`, and other variations of scientific notation are now validated properly.

src/lib/isNumeric.js

@@ -3,10 +3,17 @@ import { decimal } from './alpha';
 
 const numericNoSymbols = /^[0-9]+$/;
 
-export default function isNumeric(str, options) {
-  assertString(str);
-  if (options && options.no_symbols) {
-    return numericNoSymbols.test(str);
-  }
-  return (new RegExp(`^[+-]?([0-9]*[${(options || {}).locale ? decimal[options.locale] : '.'}])?[0-9]+$`)).test(str);
+export default function isNumeric(str, options = { no_symbols: false }) {
+  assertString(str); // verify if the str is a string, if not report a TypeError
+
+  // destructure options to extract the required properties
+  const { locale, no_symbols } = options;
+
+  // deciding the separator upfront (default separator is '.')
+  const decimalSeparator = locale ? decimal[locale] : '.';
+
+  // setting the regex depending on the value of no_symbols
+  const regex = no_symbols ? numericNoSymbols : `^[+-]?([0-9]*[${ decimalSeparator }])?[0-9]+([eE][+-]?[0-9]+)?$`;
+
+  return regex.test(str);
 }