Simplify words.

words.js

@@ -1,7 +1,13 @@
-import asciiWords from './.internal/asciiWords.js'
-import hasUnicodeWord from './.internal/hasUnicodeWord.js'
 import unicodeWords from './.internal/unicodeWords.js'
 
+const asciiWords = RegExp.prototype.exec.bind(
+  /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g
+)
+
+const hasUnicodeWord = RegExp.prototype.test.bind(
+  /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/
+)
+
 /**
  * Splits `string` into an array of its words.
  *
@@ -20,7 +26,8 @@ import unicodeWords from './.internal/unicodeWords.js'
  */
 function words(string, pattern) {
   if (pattern === undefined) {
-    return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string)
+    const result = hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string)
+    return result || []
   }
   return string.match(pattern) || []
 }