The InsertCharPre event:
Fires:
radio_button_unchecked
When a character is typed in insert mode, before inserting the char.
Notes:
radio_button_unchecked
The v:char variable indicates the char typed and can be changed during the event to insert a different character.
radio_button_unchecked
When v:char is set to more than one character this text is inserted literally.
radio_button_unchecked
Cannot change the text.