How can I check valid format of Aadhar card, driving license and Pan Card in Flutter programmatically

Question

How can I check the validity of the format of a Aadharcard, driving licence and Pan Card in the textform field in Flutter programmatically?

Solution

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 an extension of String for validate

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

Comments

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