[ Means FIRST, [default] or Start Class (in Regexp)

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[
Means FIRST, [default] or Start Class (in Regexp)

Left bracket ([) is short for the FIRST line in the file, by default. This abbreviation can be changed with Set Zip.

/list [ {list first line}

In questions, Qedit shows the default answer in square brackets:

Purge existing file [No]?

In the documentation, [ and ] indicate optional fields in commands (e.g., List [rangelist ]).

Left square bracket ([) in regular expressions indicates the start of a character class.

/List "x[abc]z" {character class starts with "a"}

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