regular expression in my lookup table

hi,all,here is my problem:

here is my search:
mysearch | table fields1 fields2
and I got:

fields1 fields2
foofoo abcccd
barbar asdddf

the lookup table I define in lookups is as below,the keywords is regular expression which I want match the fields2

keyword fields3
abcccw+ 10
asdddw+ 20

what I want is
fields1 fields2 fields3
foofoo abcccd 10
barbar asdddf 20

so how can I get this done?