Use Regex to ensure the input is exactly 5 numeric digits (e.g., ^(\d{5})$ ).
Instantly update the UI fields for "City" and "District" to reduce user typing effort. 2. Key Mapping Examples Postal Code 00100 Colombo 01 (Fort) 20000 Kandy 80000 Galle 40000 Jaffna 3. Technical Implementation Strategy srilankan55zip
Integrate a comprehensive list of Sri Lanka's 500+ post offices. Use Regex to ensure the input is exactly 5 numeric digits (e
Use a lightweight Node.js/Express service or a Python/Flask endpoint to serve the mapping. srilankan55zip