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,
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