[Toybox] [PATCH] Add tests for grep with implicit/explicit BREs and explicit EREs.

[enh]

This is in POSIX, but pcre2grep gets it wrong (
https://bugs.exim.org/show_bug.cgi?id=2294).
---
 tests/grep.test | 8 ++++++++
 1 file changed, 8 insertions(+)
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