Is there a standard lib function which will return the count of characters in a string?

[T L]

len(str) will get the count of bytes.

utf8.RuneCountInString(str) will get the count of runes.

but how to get the count of characters?

[Matt Silverlock]

https://blog.golang.org/strings

utf8.RuneCountInString is about as close as you will get. Do you have an example string that is not meeting expectations?

[T L]

On Saturday, July 23, 2016 at 11:04:44 PM UTC+8, Matt Silverlock wrote:

https://blog.golang.org/strings

utf8.RuneCountInString is about as close as you will get. Do you have an example string that is not meeting expectations?

 
I forgot in which article (an official one) that says character != rune. And it provides an example, character é is made up of two runes, three bytes.

[Tamás Gulácsi]

Yes, you have to normalize your String to be able to count the runes, and have that be the count of characters.

[Jan Mercl]

On Sat, Jul 23, 2016 at 5:36 PM Tamás Gulácsi <tgula...@gmail.com> wrote:

> Yes, you have to normalize your String to be able to count the runes, and have that be the count of characters.

In some scenario, where zero-width, half-width and full-width characters count all as any other character. IOW: OP should add what the count is to be used for.

--

-j

[Manlio Perillo]

The term "character" may be used to refer to a "grapheme cluster".

How to find grapheme cluster boundaries is described in

http://unicode.org/reports/tr29/

but the algorithm is not (yet?) implemented in the golang.org/x/text package

Manlio 

[T L]

Thanks for the information!

[Lars Seipel]

On Sat, Jul 23, 2016 at 08:36:03AM -0700, Tamás Gulácsi wrote:
> Yes, you have to normalize your String to be able to count the runes, and have that be the count of characters.

That would only work if there was a precomposed form for every possible
combining character sequence, which is not the case.

There are more issues. I would just give up on the concept of a
"character count". It's unlikely to be what you need anyway.