On Oct 24, 2013, at 7:38 , Anne van Kesteren <ann...@annevk.nl> wrote:
> On Thu, Oct 24, 2013 at 3:31 PM, Mathias Bynens <math...@qiwi.be> wrote:
>> Imagine you’re writing a JavaScript library that escapes a given string as
>> an HTML character reference, or as a CSS identifier, or anything else. In
>> those cases, you don’t care about grapheme clusters, you care about code
>> points, cause those are the units you end up escaping individually.
>
> Is that really a common operation? I would expect formatting,
> searching, etc. to dominate. E.g. whenever you do substr/substring you
> would want that to be grapheme-cluster aware.
There are cases where you don't care about grapheme clusters, e.g. if you want
to replace any occurrence of "{" + varname + "}" in a string with the value of
the variable named varname.
In cases where you do care about grapheme clusters, it's usually more efficient
to search based on code points or code units first, and then check whether the
substring found begins and ends on grapheme cluster boundaries (e.g., if a
search for "n" finds the first character of Claude's example "n̈", then you'll
want to ignore that match).
Norbert
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