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            try:
                expr.parse_string("123 456 A789")
            except pp.ParseException as pe:
                print(pe.explain(depth=0))

        prints::

            123 456 A789
                    ^
            ParseException: Expected W:(0-9), found 'A'  (at char 8), (line:1, col:9)

        Note: the diagnostic output will include string representations of the expressions
        that failed to parse. These representations will be more helpful if you use `set_name` to
        give identifiable names to your expressions. Otherwise they will use the default string
        forms, which may be cryptic to read.

        Note: pyparsing's default truncation of exception tracebacks may also truncate the
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