On Mon, Dec 15, 2014 at 6:09 PM, Stephen J. Butler <stephen.but...@gmail.com
> wrote:
>
> If you read the ICU docs on regular expressions you'll see that it sets an
> 8MB limit on head size when evaluating. My guess is that you've run into
> this and NSRegularExpression misses a return code somewhere.
>

I would have thought 50 000 characters is not that much. But then again, I
don't really know how ICU works... Reading the ICU docs further, there it
says:

Because ICU does not use program recursion to maintain its backtracking
> state, stack usage during matching operations is minimal, and does not
> increase with complex patterns or large amounts of backtracking state.



> But your pattern is really suboptimal for what you're trying to accomplish.
>

It's really a reduced test case.
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