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     +----------------------------------- any number of any characters
     |                                    before toss-tag field
...
     |      |      |         |      |
 /---+----\/+\/----+----\/---+---\/-+-----------------------\
'line 2 xx Foo NineChars 1234-12.3 other 123 first valid keep'

c:\@Work\Perl\monks>perl -wMstrict -e
"use Data::Dump qw(dd);
...
  "line 11 Foo ninechars 1234-21.3 same offset, different sn: keep",
  "line 13 no Foo number: keep",
]