[O] org 9.1.9 fails to open the document with many radio targets in Emacs 26.1

ion I met, please send the mail to me, I will send it to you directly. Thanks! The best Bill Sun Shanghai China

[O] Radio targes with regex

Hi, I run Emacs 24.1, it seems the radio target with regex does not work. For example: <<>>. In the Emacs 23.4.1 with org 6.33x, the radio targets works well. Could everyone please help me how to configure the emacs 24.1 with full feature of the radio targe? Thanks Bill Emacs