Dictionary is created and returned.  {expr1} remains
		unchanged.  Items can still be changed by {expr2}, if you
		don't want that use |deepcopy()| first.

                Parameters: ~
                  • {expr1} (`any`)
                  • {expr2} (`any`)

                Return: ~
                  (`any`)

mapset({mode}, {abbr}, {dict})                                        *mapset()*
mapset({dict})
		Restore a mapping from a dictionary, possibly returned by
		|maparg()| or |maplist()|.  A buffer mapping, when dict.buffer
		is true, is set on the current buffer; it is up to the caller
		to ensure that the intended buffer is the current buffer. This
		feature allows copying mappings from one buffer to another.
		The dict.mode value may restore a single mapping that covers
		more than one mode, like with mode values of '!', ' ', "nox",
		or 'v'. *E1276*

		In the first form, {mode} and {abbr} should be the same as
		for the call to |maparg()|. *E460*
		{mode} is used to define the mode in which the mapping is set,
		not the "mode" entry in {dict}.
		Example for saving and restoring a mapping: >vim
			let save_map = maparg('K', 'n', 0, 1)
			nnoremap K somethingelse
			" ...
			call mapset('n', 0, save_map)
<		Note that if you are going to replace a map in several modes,
		e.g. with `:map!`, you need to save/restore the mapping for
		all of them, when they might differ.

		In the second form, with {dict} as the only argument, mode
		and abbr are taken from the dict.
		Example: >vim
			let save_maps = maplist()->filter(
						\ {_, m -> m.lhs == 'K'})
			nnoremap K somethingelse
			cnoremap K somethingelse2
			" ...
			unmap K
			for d in save_maps
			    call mapset(d)
			endfor
<

                Parameters: ~
                  • {dict} (`table<string,any>`)

                Return: ~
                  (`any`)

match({expr}, {pat} [, {start} [, {count}]])                           *match()*
		When {expr} is a |List| then this returns the index of the
		first item where {pat} matches.  Each item is used as a
		String, |Lists| and |Dictionaries| are used as echoed.

		Otherwise, {expr} is used as a String.  The result is a
		Number, which gives the index (byte offset) in {expr} where
		{pat} matches.

		A match at the first character or |List| item returns zero.
		If there is no match -1 is returned.

		For getting submatches see |matchlist()|.
		Example: >vim
			echo match("testing", "ing")	" results in 4
			echo match([1, 'x'], '\a')	" results in 1
<		See |string-match| for how {pat} is used.
								*strpbrk()*
		Vim doesn't have a strpbrk() function.  But you can do: >vim
			let sepidx = match(line, '[.,;: \t]')
<								*strcasestr()*
		Vim doesn't have a strcasestr() function.  But you can add
		"\c" to the pattern to ignore case: >vim
			let idx = match(haystack, '\cneedle')
<
		If {start} is given, the search starts from byte index
		{start} in a String or item {start} in a |List|.
		The result, however, is still the index counted from the
		first character/item.  Example: >vim
			echo match("testing", "ing", 2)
<		result is again "4". >vim
			echo match("testing", "ing", 4)
<		result is again "4". >vim
			echo match("testing", "t", 2)
<		result is "3".
		For a String, if {start} > 0 then it is like the string starts
		{start} bytes later, thus "^" will match at {start}.  Except
		when {count} is given, then it's like matches before the
		{start} byte are ignored (this is a bit complicated to keep it
		backwards compatible).
		For a String, if {start} < 0, it will be set to 0.  For a list
		the index is counted from the end.
		If {start} is out of range ({start} > strlen({expr}) for a
		String or {start} > len({expr}) for a |List|) -1 is returned.

		When {count} is given use the {count}th match.  When a match
		is found in a String the search for the next one starts one
		character further.  Thus this example results in 1: >vim
			echo match("testing", "..", 0, 2)
<		In a |List| the search continues in the next item.