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From Apache Wiki <>
Subject [Solr Wiki] Update of "AnalyzersTokenizersTokenFilters" by HossMan
Date Wed, 08 Dec 2010 20:35:33 GMT
Dear Wiki user,

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The "AnalyzersTokenizersTokenFilters" page has been changed by HossMan.
The comment on this change is: some notes on when to use CharFilter curtesy of rmuir.


+ == When To use a CharFilter vs a TokenFilter ==
+ There are several pairs of !CharFilters and !TokenFilters that have related (ie: !MappingCharFilter
+  and !ASCIIFoldingFilter) or nearly identical functionality (ie: !PatternReplaceCharFilterFactory
and !PatternReplaceFilterFactory) and it may not always be obvious which is the best choice.
+ The ultimate decision depends largely on what Tokenizer you are using, and whether you need
to "out smart" it by preprocessing the stream of characters.
+ For example, maybe you have a tokenizer such as !StandardTokenizer and you are pretty happy
with how it works overall, but you want to customize how some specific characters behave.
+ In such a situation you could modify the rules and re-build your own tokenizer with javacc,
but perhaps its easier to simply map some of the characters before tokenization with a !CharFilter.
  = Notes On Specific Factories =
  == CharFilterFactories ==

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