[PERF]Substring Filters are evaluated for every single entry 
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                 Key: DIRSERVER-1070
                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1070
             Project: Directory ApacheDS
          Issue Type: Improvement
    Affects Versions: 1.5.1
            Reporter: Emmanuel Lecharny
             Fix For: 1.5.2


When applying a substring filter, we are using a very inefficient algorithm : 
the filter is transformed to a regexp for evey entry found. This can be avoided 
if the SubstringNode stores the regexp once it has been computed for the first 
entry.

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