Yes, I like this. The double backslashing is really a pain and
confused me at first. Get off that road now while clojure is still
pretty new.
Bob
On Oct 8, 9:03 am, Chouser <[EMAIL PROTECTED]> wrote:
> On Wed, Oct 8, 2008 at 8:08 AM, Rich Hickey <[EMAIL PROTECTED]> wrote:
>
> > Will existing Clojure regex (consumer) code need to change, i.e. will
> > people need to modify their existing #"" literals and if so in what
> > way?
>
> Yes, many existing #"" literals would have new meaning or become
> invalid under this proposal.
>
> Some patterns wouldn't have to be changed. Here are a couple examples:
> #"foo"
> #"(one) *(two)"
> #"/this.*/that"
>
> By far the most common change people would have to make would be to
> remove doubled back-slashes:
> old: #"\\w" new: #"\w"
> old: #"\\(" new: #"\("
> old: #"\\bword\\b" new: #"\bword\b"
>
> Reading through Clojures string reader and Java's Pattern docs, the
> only other anomaly I've spotted is if someone was using \b to mean
> \backspace. With the proposed change, #"\b" means word boundary, so:
> old: #"\b" new: #"\x08"
>
> Most of the time, failing to update your regex literal will result in
> a valid regex that means something different. Put another way, things
> that used to match like you wanted will just stop matching. In a few
> cases (such as #"\\(") what used to be a valid regex will throw an
> exception at read time, with a detailed error message pointing out the
> position of the illegal paren.
>
> Of course if this change is unacceptable, these proposed rules could
> be applied to a new dispatch macro. One option would be something
> like #r/foo/ that would allow your choice of delimiters to further
> reduce the need for back-slash quoting within the regex.
>
> --Chouser
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