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    # do extra check that $school is acceptable
    $school //= 'null'; # regex gives undef if not found

match: /home/test/abc/.date_run_dir
    type: abc
...
    type: def
Use of uninitialized value in concatenation (.) or string at ./test7.p
+l line 31, <$_[...]> line 2.
    school:

$ cat .date_run_dir .date_file_sent.*
/project/school/data/feed_abc_2010120816.ext3
mail_abc.dat.2010120816.ext3
mail_abc.dat.2010120816.ext3