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5 Reporting bugs

Bug reports can be found at the GNU bug report logs for grep. If you find a bug not listed there, please email it to bug-grep@gnu.org to create a new bug report.

5.1 Known Bugs

Large repetition counts in the ‘{n,m}’ 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.

Back-references are very slow, and may require exponential time.