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(grep.info)Reporting Bugs

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Reporting bugs
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   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.