Hi Otto,
it seems that you have to call a dynpro screen, then the documentation is displayed.
REPORT z_test_abap_docu.
DATA: docu_container TYPE REF TO cl_gui_control.
cl_abap_docu=>show(
EXPORTING
area = 'ABEN'
name = 'REGEX_SYNTAX'
IMPORTING
docu_container = docu_container ).
CALL SCREEN 0100.
*&---------------------------------------------------------------------*
*& Module STATUS_0100 OUTPUT
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
MODULE status_0100 OUTPUT.
IF docu_container IS BOUND.
cl_gui_control=>set_focus(
EXPORTING
control = docu_container " Control
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
OTHERS = 3 ).
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE 'S' NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4
DISPLAY LIKE sy-msgty.
ENDIF.
ENDIF.
ENDMODULE. " STATUS_0100 OUTPUT
Regards Christian