Unlike most Unix utilities, Perl does not arbitrarily limit the size of your data -- if you've got the memory: Perl can slurp in your whole file as a single string.
Recursion is of unlimited depth.
Tables used by hashes grow as necessary to prevent degraded performance.
Can use sophisticated pattern matching techniques to scan large amounts of data quickly.
Although optimized for scanning text, Perl can also deal with binary data.
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