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I've been testing quiver's test case:

- With Eclipse's QuickREx plugin: it hangs. It was
configured in PCRE mode (which uses Jakarta-ORO Perl 5
regular expressions implementation), and no additional options.

- With grep: grep exits with a fatal error and dumps a stack
trace. grep was run also in Perl mode, with the command:
grep -P -f regexp.txt test.txt

I can't find an explanation for this, but I don't know much
about regexps. I hope it has some utility for the resolution
of this bug nevertheless.