Case transformations in strings
Lasse R.H. Nielsen
atwork at infimum.dk
Tue Mar 24 02:46:29 PDT 2009
On Tue, 24 Mar 2009 00:50:24 +0100, David-Sarah Hopwood
<david.hopwood at industrial-designers.co.uk> wrote:
> If converting one character to many would cause a problem with the
> reference to toUpperCase in the regular expression algorithm, then
> presumably Safari and Chrome would hit that problem. Do they, or
> do they use different uppercase conversions for regexps vs
The Regular Expression specification in ES3 doesn't use toUpperCase
directly, but rather the
Canonicalize helper function (22.214.171.124). It states:
2. Let u be ch converted to upper case as if by calling
String.prototype.toUpperCase on the one-character
3. If u does not consist of a single character, return ch.
I.e., it uses a different algorithm for regexps than for strings.
(It also prevents non-ASCII characters from canonicalizing to ASCII
> If the latter, then we should allow that, and probably require it.
It's allowed, and required, already, so that's an easy fix :)
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