perf: move some regexes to constants

src/constants.js

@@ -1,4 +1,8 @@
 export const MAX_SAFE_INTEGER = 9007199254740991
+export const NUMERIC_REGEX = /^((?:\d+)?\.?(?:\d+)?)$/
+export const LEFT_RIGHT_WHITESPACE_REGEX = /^\s+|\s+$/g
+export const LEFT_RIGHT_DOT_REGEX = /^[.]*|[.]*$/g
+export const BRACKETED_REGEX = /\[([^[\]]+)\]/g
 export const OCTAL_REGEX = /^0o[0-7]+$/i
 export const BAD_HEX_REGEX = /^[-+]0x[0-9a-f]+$/i
 export const BINARY_REGEX = /^0b[01]+$/i

src/is-numeric.js

@@ -1,8 +1,9 @@
 import isString from './is-string'
 import isNumber from './is-number'
+import { NUMERIC_REGEX } from './constants'
 
 export default function isNumeric (value) {
   if (isNumber(value)) return true
   if (!isString(value)) return false
-  return (/^((?:\d+)?\.?(?:\d+)?)$/).test(value)
+  return NUMERIC_REGEX.test(value)
 }

src/lib/_normalize-path.js

@@ -1,5 +1,10 @@
+import {
+  BRACKETED_REGEX,
+  LEFT_RIGHT_DOT_REGEX
+} from '../constants'
+
 export default function _normalizePath (path) {
   return path
-    .replace(/\[([^[\]]+)\]/g, '.$1')
-    .replace(/^[.]*|[.]*$/g, '')
+    .replace(BRACKETED_REGEX, '.$1') // bracketed path link
+    .replace(LEFT_RIGHT_DOT_REGEX, '') // leading or trailing dots
 }

src/to-number.js

@@ -2,6 +2,7 @@ import getType from './get-type'
 import isArrayLike from './is-array-like'
 
 import {
+  LEFT_RIGHT_WHITESPACE_REGEX,
   BINARY_REGEX,
   OCTAL_REGEX,
   BAD_HEX_REGEX
@@ -26,7 +27,7 @@ export default function toNumber (value, round) {
     rolling = String(rolling)
   }
 
-  rolling = rolling.replace(/^\s+|\s+$/g, '')
+  rolling = rolling.replace(LEFT_RIGHT_WHITESPACE_REGEX, '')
 
   const isBinary = BINARY_REGEX.test(rolling)
   if (isBinary || OCTAL_REGEX.test(rolling)) {