Added regex category, and few case change snippets in string manipulation JavaScript.

[aumirza]

Description

Type of Change

• [✔️] ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• [✔️] I have tested my code and verified it works as expected.
• [✔️] My code follows the style and contribution guidelines of this project.
• [✔️] Comments are added where necessary for clarity.
• [✔️] Documentation has been updated (if applicable).
• [✔️] There are no new warnings or errors from my changes.

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