How can i check valid format of Aadharcard, driving licence and Pan Card in textform field in Flutter programmatically

CodePudding user response：

You can use regex to validate all types of patterns. Like Pancard has pattern like ABCDE111F. Aadhar card is just 12 digit number and so on.

CodePudding user response：

The fastest and easiest solution is to use a regex expression:

extension AadharNumberValidator on String {
  bool isValidAadharNumber() {
    return RegExp(
            r'^[2-9]{1}[0-9]{3}\\s[0-9]{4}\\s[0-9]{4}$')
        .hasMatch(this);
  }
}

extension PanCardValidator on String {
  bool isValidPanCardNo() {
    return RegExp(
            r'^[A-Z]{5}[0-9]{4}[A-Z]{1}$')
        .hasMatch(this);
  }
}

extension DrivingLicense Validator on String {
  bool isValidLicenseNo() {
    return RegExp(
            r'^(([A-Z]{2}[0-9]{2})( )|([A-Z]{2}-[0-9]{2}))((19|20)[0-9][0-9])[0-9]{7}$')
        .hasMatch(this);
  }
}

And use extension of String for validate

TextFormField(
  autovalidate: true,
  validator: (input) => input.isValidAadharNumber() ? null : "Check your aadhar number",
)