Trying to simplify MappingCharFilter to match whole field

[Paul Taylor]

I'm trying to create a CharFilter which works like MappingCharFilter but 
only changes the matchString if the match String matches the whole field 
rather than a portion in the field (this is to handle some exceptions 
wiyout effecting other data). Trouble is the code in MappingCharFilter 
is devoid of comments and I cant figure out what I need to change, any 
ideas ?

Paul
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