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  1. or download this
    /^\Q$host\E$/;
 ^ ^      ^^
...
 | |      + - End quote metacharacters
 | + - Begin quote metacharacters (e.g., [.*\+], etc.)
 + - Match beginning at the start of the line
  2. or download this
    use warnings;
use strict;
...
db4323
dbwindows822.tp.com
db726.tp.com
  3. or download this
    db
  4. or download this
    db
db4323
dbwindows822.tp.com
db726.tp.com