New radio PIDs

[Vangelis forthnet]

 On Sun Aug 13 10:05:39 BST 2017, Ralph Corderoy wrote:

>  ^(?:[bp]0|w3)[a-z0-9]{6}$

 Cheers Ralph, your coding skills are always welcome in this list! :-)
I was about to say that the above assumes that ordinary PIDs 
will continue to begin with "(b|p)0" and that "new" WSR ones 
will always begin with "w3", when M Clark posted: 

http://lists.infradead.org/pipermail/get_iplayer/2017-August/010994.html  

which, of course, brought new data to light...

 FWIW, I revisited the definitive article on PIDs (WARNING: Long read!):  

http://smethur.st/posts/176135860

> The only character in a PID that is "meaningful" 
> is the first one which denotes the authority of the PID 
> (the people responsible for creating it). 
> For PIDs starting b the generating authority is Red Bee, 
> for PIDs starting p it's PIPs, 
> for w it's the old World Service scheduling system.
> (snip)
> Because World Service programme information doesn't travel 
> through Red Bee they self-provision programme data into PIPS 
> which lead to their early PIDs looking slightly different 
> to most, being 11 characters, not 8:
> http://www.bbc.co.uk/programmes/wcr5dr3dnl3
> I'm not sure when the changeover happened 
> but these days World Service PIDs are generated as p PIDs 
> with a PIPs authority and are 8 characters long.

 So in the distant past (June 2008) there used to be 11-digit 
PIDs beginning with "w" for WSR programmes; 
what brought about the new PIDs system with either 8 
or 15-digit "w" PIDs remains unclear (?) ... 
Maybe "Jim web" could, once more, poke his BBC Radio contacts? 

 On Sun Aug 13 19:51:22 BST 2017, James Scholes wrote:

> ^[0-9b-df-hj-np-tv-z]{8,}$

 Hi James, so nice you dropped by with such 
an interesting find!
 Did a bit of googling myself, "[0-9b-df-hj-np-tv-z]{8,15}" 
comes up inside deprecated projects: 
http://www.bbc.co.uk/frameworks/micro/guides/projectjson
http://www.bbc.co.uk/frameworks/micro/guides/projectjsonv2
both part of MICRO...
Also, 
http://www.bbc.co.uk/frameworks/route/reference
has it in this line: 
> programme.reqs.pid = "[0-9b-df-hj-np-tv-z]{8,15}"

 Of relevance:
https://www.npmjs.com/package/bbc-pid

> BBC Programmes Identifiers 0.4 spec 
> defines a PID as following:
> Characters: digits 0-9 and lower case letters, less vowels.
> Length: Minimum 8 digits. No defined maximum 
> - they will grow as necessary.
> For historical reasons there are some 15 character pids 
> existing for World Service content.

... Historical reasons?

Cheers, 
Vangelis.