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I know \(...\) is Vim's way to create a capturing group. It was listed under the atom entry in Vim's doc. There are two other forms of atom, \%(...\) and \z(...\). The document is not very clear on what exactly does they do. Could anyone help to explain it please?

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/\%( permits to define a group as with /\(, but we cannot refer to text matched by this group with /\1 or with submatch() from commands like :substitute or functions like matchlist().

Having a group permits to apply counting and other things to the group (/star, /\+, /\?...)

While /\%( hides, /\z( seems to do the opposite, it exports a group found outside the context where it has been found. It seems to apply only to syntax highlighting. I've never used it.

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    Thanks for the explanation! So \%( is kind of like non-capturing group to me. – Just a learner May 13 at 7:49
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    This is exactly a non capturing group. – Luc Hermitte May 13 at 7:50
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    Yes, /\z( is only valid for syntax highlighting definitions, because you need to define start and end patterns and you might want to make sure, that the part matched in a start pattern is also in an end pattern available – Christian Brabandt May 13 at 7:56

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