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

##</code><code>##

match: /home/test/abc/.date_run_dir
	type: abc
Use of uninitialized value in concatenation (.) or string at ./test7.pl line 31, <$_[...]> line 1.
	school: 
match: /home/test/def/.date_run_dir
	type: def
Use of uninitialized value in concatenation (.) or string at ./test7.pl line 31, <$_[...]> line 2.
	school: 

##</code><code>##

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