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Hi There,You could try with the implementation done around similar requirement shared on below threads:https://salesforce.stackexchange.com/questions/331756/validating-the-input-field-in-the-vf-pagehttps://developer.salesforce.com/forums/?id=9060G000000UaeSQASHope above information helps. Please mark as Best Answer so that it can help others in future.Thanks.