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The same applied for many other backslash-escaped bytes, not just
metacharacters. The switch to rawmemchr in v3.4-almost-10-g9393b97
made some parts of the code require the usually-guaranteed newline
sentinel at the end of each pattern. Before, some consumers used a
(correct) pattern length and did not care that try_fgrep_pattern could
transform a pattern (with sentinel) like "\\.\n" to "..\n", thus
violating that assumption.
* src/grep.c (try_fgrep_pattern): Preserve the invariant
that each regexp is newline-terminated.
* tests/backslash-dot: New file. Test for this.
* tests/Makefile.am (TESTS): Add it.
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