[Bug 1935037] Re: Invalid charactor in field name

[mdavidsaver via Core-talk <core-talk at aps.anl.gov>]

> I would prefer to traverse the "normal" structure way with '.' instead
of

'.' is used to traverse a Structure.  '->' is selecting a member of a
Union.

https://mdavidsaver.github.io/pvxs/value.html#_CPPv4N4pvxs5ValueixERKNSt6stringE

> Attempt to access a descendant field.
> 
> Argument may be:
> 
>     name of a child field. eg. “value”
>     name of a descendant field. eg “alarm.severity”
>     element of an array of structures. eg “dimension[0]”
>     name of a union field. eg. “->booleanValue”
> 
> These may be composed. eg.
> 
>     “dimension[0].size”
>     ”value->booleanValue”

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https://bugs.launchpad.net/bugs/1935037

Title:
  Invalid charactor in field name

Status in EPICS Base:
  New

Bug description:
  When creating a group in QSRV, the allowed characters are too
  restrictive

  error:
  Error Group not created: Invalid charactor '-' (45) in field name "BI02-TimeRise" must be A-Z, a-z, 0-9, or '_'

  expected behaviour:
  pva structures should allow for a more liberal set of characters that just what is covered by \w regex metacharacter.

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