John Powers wrote:
Hello,
Lucene only lets you use a wildcard after a term, not before, correct?
What work arounds are there for that?
If I have an item 108585-123
And another 332323-123
How can I look for all the -123 family of items?
Classic indexing problem. Here are a couple simple ideas.
1. If the dash in these items means that the two sets of numbers are,
in fact, different attributes, AND you only want to prefix entire
attributes, then separate them into their own fields in Lucene. That
is, instead of a FOOBAR field with entries like 108585-123, have a FOO
field with entries like 108585 and 332323, and a BAR field with entries
like 123. To look for all items in the 123 family, simply search only
on the BAR field.
2. If you want arbitrary postfixing for ITEM (in addition to the
arbitrary prefixing Lucene already provides), encode ITEM in the index
in forward and reverse directions. In other words, ITEM has entries
like 108585-123 and 332323-123, and REVITEM has entries like 321-585801
and 321-332323. To look for all items in the 123 family, search for
"321*" on REVITEM. To look for all items in a family ending in 3, the
equivalent of "*3" in ITEM, search for "3*" in REVITEM.
Good luck!
--MDC
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