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Your results are consistent with my theory.

Since the hyphen (identified in the conversion tables as 'subtraction
sign') is ASCII x'2d' but EBCDIC x'60' it will be found within the range
x'00' to x'3f' if, as I suspect, the string passed into the regex processor
(wherever that may be) is evaluated as ASCII instead of EBCDIC.

btw, I like the simple VALUES EXPRESSION format you use for your tests.
Don't know why I didn't think of that and waste my time building common
tables.

Another test clinches it:
values regexp_instr('grave`concern_', '[\x5f-\x60]') -- Result 6
... take the grave out and replace with a space
values regexp_instr('grave concern_', '[\x5f-\x60]') -- Result 14

The grave symbol is ASCII x'60' and underscore x'5f'
The EBCDIC equivalents are x'79' and x'6d' so we shouldn't have found
either.

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