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5 Reporting bugs

Email bug reports to, a mailing list whose web page is The Savannah bug tracker for grep is located at

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.