Add regex to remove groups in description

Allow to keep other useful information, like teacher names.

Guides/ics-vim.md

@@ -2,9 +2,13 @@
 
 Tips to modify an autogenerated ics file with the Vim text editor.
 
+## Remove groups from description
+
+`%s/\/\?\(INGE_\)\?EI_[A-Z0-9_]*,\? \/\? \?//g`
+
 ## Remove useless description
 
-Vim command : `:%s/^ - DESCRIPTION : .*\n//c`
+Vim command : `:%s/^ - DESCRIPTION : \n//`
 
 ## Remove unescaped \n
 
@@ -70,7 +74,7 @@ SUMMARY:TD,ALL
 
 ## Swap type of course and subject
 
-Vim command : `%s/SUMMARY:\(.*\),\(.*\)/SUMMARY:\2,\1/c`
+Vim command : `%s/SUMMARY:\(.*\),\(.*\)/SUMMARY:\2,\1/`
 
 Before :
 ```