Fix capitalizing words that start with numbers (#346)

Author: v-fernandez

packages/title-case/src/index.spec.ts

@@ -144,6 +144,8 @@ const TEST_CASES: [string, string, Options?][] = [
     'An example. "I.e. test."',
     { sentenceCase: true },
   ],
+  ["friday the 13th", "Friday the 13th"],
+  ["21st century", "21st Century"],
 ];
 
 describe("swap case", () => {

packages/title-case/src/index.ts

@@ -1,7 +1,7 @@
 const TOKENS = /(\S+)|(.)/g;
 const IS_SPECIAL_CASE = /[\.#]\p{Alphabetic}/u; // #tag, example.com, etc.
 const IS_MANUAL_CASE = /\p{Ll}(?=[\p{Lu}])/u; // iPhone, iOS, etc.
-const ALPHANUMERIC_PATTERN = /\p{Alphabetic}+/gu;
+const ALPHANUMERIC_PATTERN = /[\p{Alphabetic}\p{Nd}]+/gu;
 const IS_ACRONYM =
   /^(\P{Alphabetic})*(?:\p{Alphabetic}\.){2,}(\P{Alphabetic})*$/u;