[bug #18633] regular expressions case-insensitivity

[Benno Schulenberg]

Follow-up Comment #5, bug #18633 (project grep):

> Part of my confusion was due to other tools (such as sed, awk
> and vi), not using the collation order specified in the locale
For the first two that would be a bug.  I don't know about 'awk', but here at
least 'sed' uses the specified collation order.

> Anyway, thanks for helping me come to a better understanding
> of grep and locale, and apologies for assuming it was a bug.
No problem.

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