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while (<DATA>) {
    @res = /(\d{4}(?:-\d\d){2}).*dates processed: (.*)/;
...
2009-02-02 06:12:57,500 dates processed: 2009-01-31, 2009-01-29, 2009-
+01-30
2009-02-18 06:03:47,713 dates processed: 2009-02-16, 2009-02-17
2009-02-19 05:58:29,138 dates processed: 2009-02-18

2009-02-02 2009-01-31, 2009-01-29, 2009-01-30 at tst.pl line 3, <DATA>
+ line 1.
2009-02-18 2009-02-16, 2009-02-17 at tst.pl line 3, <DATA> line 2.
2009-02-19 2009-02-18 at tst.pl line 3, <DATA> line 3.

use Data::Dumper;
while (<DATA>) {
...
2009-02-02 06:12:57,500 dates processed: 2009-01-31, 2009-01-29, 2009-
+01-30
2009-02-18 06:03:47,713 dates processed: 2009-02-16, 2009-02-17
2009-02-19 05:58:29,138 dates processed: 2009-02-18

$VAR1 = [
          '2009-02-02',
...
          '2009-02-19',
          '2009-02-18'
        ];