Extract more literal n-grams from regex queries for tighter index pruning#3
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Cross-product nested alternation up to MAX_DNF=32 branches; beyond that, drop the offending group conservatively (treat as wildcard).
Negated, ranged, special-escape, and multi-char-quantifier classes still fall back to wildcard treatment. /serv[ei]rless/ now prunes to 'serverless' or 'servirless' instead of just 'rless'.
When every inner branch of a group is a single contiguous literal, the group concats into the surrounding run instead of standing alone. /(eigen|petri)(value|chor)/ now extracts the four full words; Wikipedia transfer drops from 247 MB to 51 MB.
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[ei]) into the surrounding literal run instead of treating them as wildcards/(eigen|petri)(value|chor)/extract the full words/(eigen|petri)(value|chor)/drops from 247 MB to 51 MB