On 11/14/06, Peter Boughton <[EMAIL PROTECTED]> wrote:
> Ah, I knew I was missing something.
> ....but... you can prevent that with a negative lookahead. :)
> Something along the lines of.
> <Emphasis type="([a-z])[^"]+">([^<]|<(?!Emphasis))+?</Emphasis>
> So it only matches Emphasis tags that do not themselves contain the
> <Emphasis string.
> That should work, right? (inside an appropriate cfloop)
In a pure world, then maybe. But in the world created by this
example, the tags *do* contain other tags of the same type. This
would match a tag if, and only if, it did *not*. The tags wouldn't
get replaced if other tags of the same type were nested inside.
The regex you applied would, in effect, find the innermost Emphasis
tag of a particular group, but there may be many levels of nest and
even many adjacent tags. Everything isn't quite that neat, I don't
think. :-)
Given:
<Book>
<Emphasis type="Bold">
sample text
<Emphasis type="Italic">
sample Text
<Emphasis type="underline">
sample text
</Emphasis>
</Emphasis>
sample text
</Emphasis>
<Emphasis type="Bold">
sample text
<Emphasis type="Italic">
sample Text
<Emphasis type="underline">
sample text
</Emphasis>
</Emphasis>
sample text
</Emphasis>
</Book>
Your regex would find the innermost tag of the first group, but
without the help of additional code it wouldn't be able to adjust to
the next, non-nested group nor would it be able to jump to the
adjacent group.
I think you're right - it could be done, but it doesn't seem as
intuitive to my brain. To me it's easier to find a particular tag
(using /<Emphasis type="[a-z]+">/ or whatever regex) and from the end
point of that tag look for /<\/?Emphasis>/. If you encounter another
open Emphasis tag, increment the counter, if you encounter a close
Emphasis tag and the counter is "0" then you've found the end tag
you're looking for, else decrement the counter.
Like anything else, I guess: there's more than one way to do it. I
just can't quite wrap my brain around the way you're proposing. :-)
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