With 'regexpengine' set to 0 or 2, ":h \^x" displays this error message:
INTERNAL: Unknown character class char: 67 E149: Sorry, no help for \^x With 'regexpengine' set to 1 (also before the new regexp engine was introduced), the error message is: E63: invalid use of \_ E149: Sorry, no help for \^x Any character substituted for "x" triggers this error. This is Vim 7.4a. I discovered this when trying to look up ":h i_CTRL-\_CTRL-O" in the short format ":h i^\^o". Presumably this has never worked. It is possible to look up ":h i^\" though. Best, -- -- You received this message from the "vim_dev" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to vim_dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.