Re: Some basic Vim commands

On Sun, Apr 18, 2021 at 1:33 PM 'c.willis111' via vim_use
<vim_use@googlegroups.com> wrote:
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> ------ Original Message ------
> From: "Romain Lafourcade" <romainlafourcade@gmail.com>
> To: "vim_use" <vim_use@googlegroups.com>
> Sent: Sunday, 18 Apr, 2021 At 09:42
> Subject: Re: Some basic Vim commands
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> > Is there a single command to delete all initial whitespace on a line?
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> :left<CR>
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> > Is there any command to the effect of "find the next number"?
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> /\d<CR>
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> > take this word and the next two words, and send them down 3 newlines.
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> This one is unclear. Do you want to create a new line with just those two words? Do you want to insert them in an existing line? Etc.
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> /\d<CR> is fine for finding a number if it is being done by the operator. Not so clever as part of a function - unless it is clear that you are starting outside a number. In particular not between the mantissa and exponent of a floating point number in scientific notation. Also what about numbers that start with a minus sign or a decimal point? The latter wd seem to be managed with /[.-]*\d<CR> (unless I've been caught out by vim's strange escape strategy).
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> Chris W

Hm, in Vim syntax a number can optionally start with a single plus or
minus sign; for an integer all the rest must be digits. A
floating-point number can in addition have a single dot (decimal
point) followed by one or more digits, and then optionally e or E
followed by one or more digits. At script version 2 or higher the
decimal point need not be preceded by any digits. All this is rather
complex, I suppose it can be done, but only by means of a function
(which can start searching with /[-+[:digit:]] and then repeat if what
was found was not a "proper" number). Tricky. If different search
rules must be applied for different programming languages or texts it
becomes even more tricky.

Best regards,
Tony.

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