you could use EdgeNGramFilterFactory :

http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.EdgeNGramFilterFactory

And you should mix front and back ngram process in your analyzer :

<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15"
side="front"/>
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15"
side="back"/>

is it better ?

Ludovic.
-----Jouve
France.--
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