Configuration

use another captcha extension

You have to write a captcha adapter for this purpose. You find the adapters here:

typo3conf/ext/sf_register/Classes/Services/Captcha

Extend class

Tx_SfRegister_Services_Captcha_AbstractAdapter

The functions

render()

and

isValid()

are required for the adapter to work.

Write own validators

You can write your own validator. Validators are stored in

typo3conf/ext/sf_register/Classes/Domain/Validator ,

extends class

Tx_Extbase_Validation_Validator_AbstractValidator

and require the function

isValid().

Reference

plugin.tx_sfregister.settings:

plugin.tx_sfregister.persistence: