A thorough approach to field validation doesn’t just consider format but also deals with common pitfalls and nuances. Here’s a more in-depth look at validation patterns for banking application fields:
1. Name Field:
- Must not be blank: Ensure the name field isn’t empty.
- Alphabetic characters only: Names should consist of letters, spaces, apostrophes, and hyphens.
/^(?! )[^0-9`!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?~]+$/2. Mobile Number:
- Must not be blank.
- Exactly 10 digits: Mobile numbers should be 10 digits.
- Optionally start with a country code: Like ’91’ for India.
/^(\+91[\-\s]?)?[0]?(?!0)\d{10}$/3. Aadhaar Card (specific to India):
- Must not be blank.
- Exactly 12 digits: Unique identification number.
/^\d{12}$/4. PAN Card (specific to India):
- Must not be blank.
- Standard format: 5 alphabets, 4 digits, then an alphabet.
/^[A-Z]{5}\d{4}[A-Z]{1}$/5. Email Address:
- Must not be blank.
- Common format: Local part, “@” symbol, domain.
/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,6}$/6. Bank Account Number:
- Must not be blank.
- Up to 16 digits: Varies by bank, some have fewer digits.
/^\d{1,16}$/7. IFSC Code (specific to India):
- Must not be blank.
- Standard format: 4 alphabets, a zero, 6 characters (alphabets/numbers).
/^[A-Z]{4}0[A-Z0-9]{6}$/8. Date of Birth:
- Must not be blank.
- Common format:
DD/MM/YYYYorMM/DD/YYYY.
/^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$/9. Password:
- Must not be blank.
- Mix of characters: Upper, lower letters, a number, a special character, at least 8 chars long.
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$Additional Pro Tips:
- Use meaningful error messages: “Mobile number should be 10 digits and can optionally start with +91.”
- Client-Side Validation is not enough: Always validate data server-side before processing.
- Stay updated: Regularly check for the best practices in field validations, especially if rules or regulations change.
By using the above robust validation patterns, developers can reduce the potential for errors and ensure a smooth and efficient user experience in their banking applications.
Make sure to adjust and test these regex patterns in your specific development environment. Also, consider adding a layer of user-friendliness: When a user input fails a regex test, provide them with an easily understood error message that helps them correct the mistake.