Hmm... although I have extensive documentation on the overall function
(which I wrote quite a few years ago), I didn't document the regexp in
detail. My notes (which are obviously ancient, based on the browsers
mentioned) refer to the various ways that different browsers report
transparency, such as "transparent" -or- "rgba(0, 0, 0, 0)" -or- other
variations... let me now quote my old notes verbatim:
BUT would all CSS3 engines format the transparency string precisely that
way? I’m pretty sure they’d start with “rgba” and end with “,0) or maybe “,
0 )”, but I’m not so sure about what might come in between. It might be
safer to use a regexp something like:
var css3Transp= /^rgba.*,\s?0\s?\)$/i
or maybe combine the two possible formulations of ‘transparent’ (the
traditional form and the CSS3 form) into:
var noCol = /^transparent|rgba.*,\s?0\s?\)$/i
[Back to the present] Yes, I'm not entirely sure why the regexp was
written like that, and I should have documented it more carefully... but it
seems to work, even in modern browsers.
- - - - previous posts: - - - -
On Tuesday, January 20, 2015 at 6:52:42 PM UTC-5, Ronald J Kimball wrote:
>
> On Sun, Jan 18, 2015 at 06:12:21PM -0800, San wrote:
> > Thanks, I'm sure you're right. I should have seen that.
> >
> > On the broader question of whether I need to "fix" this at all... does
> the
> > fact that a function doesn't balance in BBEdit imply that the function
> is
> > brittle, i.e. might throw an error under some circumstances, even though
> > I'm not seeing any errors?
>
> It actually implies that the Balance Tags feature is brittle. It has to
> deal with double-quoted strings, single-quoted strings, regular
> expressions, comments, and so on, and sometimes it gets it wrong.
>
> An alternative way to resolve this is to use "\x29" instead of "\)" in the
> regular expression, as \x29 is the hexadecimal escape sequence for a right
> parenthesis:
>
> /^transparent|rgba.*,\s?0\s?\x29$/i
>
>
> By the way, I'm concerned about the structure of this regular expression.
> It matches either:
>
> 1) "transparent" at the start of the string; or
> 2) "rgba", followed by any number of characters, then ",", an optional
> whitespace character, "0", an optional whitespace character, and ")",
> at
> the end of the string.
>
> For example, it would match both of these strings:
>
> "transparent blah blah blah"
> "blah blah blah rgba blah blah blah, 0 )"
>
> Is that really what is intended?
>
> Ronald
>
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