grep, print lines matching a pattern - 6. Reporting bugs

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# 6. Reporting bugs

Email bug reports to bug-gnu-utils@gnu.org. Be sure to include the word "grep" somewhere in the "Subject:" field.

Large repetition counts in the ``{m,n}'` construct may cause GREP to use lots of memory. In addition, certain other obscure regular expressions require exponential time and space, and may cause grep to run out of memory. Backreferences are very slow, and may require exponential time.

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