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Fix long iter again #187

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robinchm
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Fix #185
The idea is to cache the first fail_node during iteration. Later if a last_node is found (meaning a match, surely longest), the cached fail_node is not used and discarded. If no match is found, instead of continuing, we rewind to the cached node to try shorter match that we missed earlier.

@pombredanne
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@robinchm based on #185 (comment) this is likely leaking some memory. Can you have a look into this?
Thanks!

@eloyfelix
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Hi, we've experienced the same issue when tring to use it to extract biological entities from large texts (papers, patents).

This was referenced Oct 28, 2024
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new 'iter_long' match misses after the recent fix
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