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# This file is a comment and should not be used
 # This comment has one leading space
...
/dev/mapper/centos-var_log /var/log                xfs     defaults   
+     1 2
 /dev/donstest  /expert         none    1 1 -rw,noglob # this is a fs
 #/dev/donstest22   /expert         none    1 1 -rw,noglob # this is a
+ fS

 
#!/usr/bin/perl
use strict;
...
        print "IS Comment: $line \n";
    }
}

IS Comment: # This file is a comment and should not be used
NOT Comment:  # This comment has one leading space
...
NOT Comment: /dev/mapper/centos-var_log /var/log                xfs   
+  defaults        1 2
NOT Comment:  /dev/donstest     /expert         none    1 1 -rw,noglob
+ # this is a fs
NOT Comment:  #/dev/donstest22   /expert         none    1 1 -rw,noglo
+b # this is a fS