Split by case should take `,` and space into account

[memochou1993]

Environment

• scule: 1.3.0
• Node: v20.13.0

Reproduction

titleCase('hello, world!')
// actual: Hello, world!
// expected: Hello, World!

titleCase('is_technical')
// actual: is Technical
// expected: Is Technical

Describe the bug

According to the documentation, titleCase is supposed to capitalize all words.

Even small words like "is," if they appear as the first word, should be capitalized.

Additional context

No response

Logs

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