Added match expressions.

http://www.digitalmars.com/d/changelog.html

Nifty feature. Would be handy if regex searches be included as well - for continuous buffers and for chunked buffers.

Chr. Grade

In article <dt088d$1svm$1@digitaldaemon.com>, Walter Bright says...
>
>Added match expressions.
>
>http://www.digitalmars.com/d/changelog.html
>

"Chr. Grade" <Chr._member@pathlink.com> wrote in message news:dt0ait$1v78$1@digitaldaemon.com...
>
> Nifty feature. Would be handy if regex searches be included as well - for continuous buffers and for chunked buffers.

Not sure what you mean?

On Wed, 15 Feb 2006 14:49:14 -0800, Walter Bright wrote:

> "Chr. Grade" <Chr._member@pathlink.com> wrote in message news:dt0ait$1v78$1@digitaldaemon.com...
>>
>> Nifty feature. Would be handy if regex searches be included as well - for continuous buffers and for chunked buffers.
> 
> Not sure what you mean?

Oh, I'm positive I don't know what Chr. means :-)

What is a "continuous buffer" in this context?
What is a "chunked buffer"?

-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
"Down with mediocracy!"
16/02/2006 10:11:17 AM

Nice, these match expressions make things really handy. At first I was confused on what I would use them for, but I started programming for a little bit and already found a use for them. Namely, assert(filename ~~ "*.wav"), assuming I understand it correctly.

Walter Bright wrote:
> Added match expressions.
> 
> http://www.digitalmars.com/d/changelog.html
> 
> 
> 

One thing I forgot to ask, do we have

this()
in
{
}
out
{
}
body
{
}

Yet? Thanks.
~ Clay

clayasaurus wrote:
> Nice, these match expressions make things really handy. At first I was confused on what I would use them for, but I started programming for a little bit and already found a use for them. Namely, assert(filename ~~ "*.wav"), assuming I understand it correctly.
> 
> Walter Bright wrote:
>> Added match expressions.
>>
>> http://www.digitalmars.com/d/changelog.html
>>
>>
>>

Walter Bright wrote:
> Added match expressions.

Interesting.  So where can I find documentation on pattern syntax?  The docs for std.regexp doesn't seem to mention it.  Is it just the classic textbook syntax, or are there differences?


Sean

On Wed, 15 Feb 2006 13:52:12 -0800, Walter Bright wrote:

> Added match expressions.

Too lazy to test sorry. Do match expressions support Unicode or just ASCII?

-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
"Down with mediocracy!"
16/02/2006 10:44:23 AM

"clayasaurus" <clayasaurus@gmail.com> wrote in message news:dt0dm6$228a$1@digitaldaemon.com...
> Nice, these match expressions make things really handy. At first I was confused on what I would use them for, but I started programming for a little bit and already found a use for them. Namely, assert(filename ~~ "*.wav"), assuming I understand it correctly.

It's the other way around, the regexp is on the left. Also, operating system wildcard thing isn't the one used, it's real regular expressions from std.regexp. So you'd write it as:

    assert(".wav$" ~~ filename);

which means any string ending in ".wav".

std.path.fnmatch() does operating system style wildcards like "*.wav" - I could make that work with the match expressions too if there's a desire (because operator overloading works with it!).

Another example of things you can do:

    assert("^abc" ~~ string);    // (1)

matches any string that starts with the string "abc". It's a little klunky to do otherwise,

    assert(string.length >= 3 && string[0..3] == "abc");   // (2)

Currently, evaluating ("^abc"~~string) invokes the full std.regexp machinery. But a compiler is free to optimize (1) into (2). I'm thinking of Eric and Don's examples of generating custom recognizers for static regex strings. This could make D's regex support into a real screamer.

"Sean Kelly" <sean@f4.ca> wrote in message news:dt0ds9$226k$1@digitaldaemon.com...
> Walter Bright wrote:
>> Added match expressions.
>
> Interesting.  So where can I find documentation on pattern syntax?  The docs for std.regexp doesn't seem to mention it.  Is it just the classic textbook syntax, or are there differences?

There's a link in the std_regexp page to it: www.digitalmars.com/ctg/regular.html

It's the classic syntax.