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On 1/23/10 9:46 PM, Daniel Colascione wrote:
> Add this somewhere in retest.c:
>
> test_comp("^(?:(hello)|($))", REG_EXTENDED, 0);
> test_exec("hello asdf", REG_OK, 0, 5, -1, -1, END);
>
> The ($) subgroup matches (with an empty match) even though it shouldn't
> (because we're not at the end of the string).
By the way: '^(?:(hello)|($?$))' seems to match the same strings, but
not exhibit the phantom match behavior.
(Or $+, or ${1,1}, or seemingly anything else that forces TRE to
allocate an additional state. According to the debug output, the
compiler is using the same (!) tags for subgroups 1 and 2 in the
original example.)
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