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use 5.012;
use String::Diff;
...
__END__

Th<mismatch>si</mismatch> is the wi<mismatch>dl</mismatch> cat

use 5.012;
use String::Diff;
...
__END__
diff_regexp  =>  Th(?:i)s(?:i)\ is\ the\ wi(?:l)d(?:l)\ cat
diff_merge   =>  Th[i]s{i} is the wi[l]d{l} cat