+----------------------------------- any number of any characters
     |                                    before toss-tag field
     |
     |      +---------------------------- toss-tag field (defined
     |      |                             string, constant width)
     |      |
     |      |      +--------------------- any number of any non-digits
     |      |      |                      between end of toss-tag
     |      |      |                      and start of number field.
     |      |      |                      characters can vary after
     |      |      |                      first field seen, but width
     |      |      |                      cannot vary once set.
     |      |      |
     |      |      |         +----------- number field.  number cannot
     |      |      |         |            vary once set.
     |      |      |         |
     |      |      |         |      +---- any number of any characters
     |      |      |         |      |     after number field
     |      |      |         |      |
 /---+----\/+\/----+----\/---+---\/-+-----------------------\
'line 2 xx Foo NineChars 1234-12.3 other 123 first valid keep'