checkValidIFSCCode static method
Check if string is a valid Indian IFSC code
ifscCode - The IFSC code to validate
Returns true if IFSC code is valid
Implementation
static bool checkValidIFSCCode(String ifscCode) {
// IFSC format: 4 letters (bank code), 7 characters (branch code)
final ifscRegex = RegExp(r'^[A-Z]{4}[0-9]{7}$');
return ifscRegex.hasMatch(ifscCode.toUpperCase());
}