Pattern Tokenizer Factory not working with negation regular expression

[meghana]

Hi, 

I need my tokenizer factory , to split on everything expect numbers ,
letters , '&' , ':' and single quote character. 

I use 'PatternTokenizerFactory' as below,

<tokenizer class="solr.PatternTokenizerFactory"
pattern="[^a-zA-Z0-9&amp;-:]" />

but, its spiting tokens by space only . not sure what I am doing wrong in
this.

can anybody help me on this??
Thanks




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