Edit username rules to use only numbers - Joomla! Forum - community, help and support

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i'm developing 1 website required username use student matric number. how can change rules username fields use number combination , the number should 6 digits , starts number 1. example:

153948
167889
133498

can guide me? have basic knowledge of php. files should edit process registration form?

thanks in advanced

maybe default.php file com_login
you can add piece of javascript ony nummeric allowed. can checked javascript, if writing letters, won't accepted.





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