REPLACE

*DATA(text) = `aaa123bbb456ccc789`.
**cl_demo_input=>request( CHANGING field =  text ).
*
*SPLIT condense( replace( val   = text
*                         regex = `\D`
*                         with  = ` `
*                         occ = 0 ) ) AT ` ` INTO TABLE DATA(itab1).
*cl_demo_output=>display( itab ).