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my $var_name_modifier1 = '100';
my $var_name_modifier2 = '200';
...
print 'this is what we have for 100: '; 
print $specific_{$var_name_modifier1}_var;
print " \n\n";

Bareword found where operator expected at ./test.pl line 19, near "}_v
+ar"
        (Missing operator before _var?)
syntax error at ./test.pl line 19, near "}_var"
Execution of ./test.pl aborted due to compilation errors.