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Professor Michael Fourman FBCS CITP
Director, iDEA
I've used (?P=name) recently in an implementation of the porter2 stemming
algorithm from http://snowball.tartarus.org/algorithms/english/stemmer.html
This includes the rule:
## if the word ends with a double remove the last letter (so hopp -> hop)
where we
## Define a double as one of
## bb dd
