pyparsing 3.0.0rc2

• Added url expression to pyparsing_common. (Sample code posted by Wolfgang Fahl, very nice!)

  This new expression has been added to the urlExtractorNew.py example, to show how it extracts URL fields into separate results names.

• Added method to pyparsing_testing to help debugging, with_line_numbers. Returns a string with line and column numbers corresponding to values shown when parsing with expr.set_debug():

  data = """\
     A
        100"""
  expr = pp.Word(pp.alphanums).set_name("word").set_debug()
  print(ppt.with_line_numbers(data))
  expr[...].parseString(data)
  

  prints:

                1
       1234567890
     1:   A
     2:      100
    Match word at loc 3(1,4)
         A
         ^
    Matched word -> ['A']
    Match word at loc 11(2,7)
            100
            ^
    Matched word -> ['100']
  

• Added new example cuneiform_python.py to demonstrate creating a new Unicode range, and writing a Cuneiform->Python transformer (inspired by zhpy).

• Fixed issue #272, reported by PhasecoreX, when LineStart() expressions would match expressions that were not necessarily at the beginning of a line.

  As part of this fix, two new classes have been added: AtLineStart and AtStringStart.
  The following expressions are equivalent:

  LineStart() + expr      and     AtLineStart(expr)
  StringStart() + expr    and     AtStringStart(expr)
  

• Fixed ParseFatalExceptions failing to override normal exceptions or expression matches in MatchFirst expressions. Addresses issue #251, reported by zyp-rgb.

• Fixed bug in which ParseResults replaces a collection type value with an invalid type annotation (changed behavior in Python 3.9). Addresses issue #276, reported by Rob Shuler, thanks.

• Fixed bug in ParseResults when calling __getattr__ for special double-underscored methods. Now raises AttributeError for non-existent results when accessing a name starting with '__'. Addresses issue #208, reported by Joachim Metz.

• Modified debug fail messages to include the expression name to make it easier to sync up match vs success/fail debug messages.