Need Your Help for small corection

[desul]

hi,

Can you tell why (NN NN NN NN ) IS NOT WORKING BELOW PROGRAM and (JJ) is only alone coming. actually, i required this pattern (jj* NN+)

PLEASE COPERATE ME TO CORRECT THIS CODE

class extract(object):     def __init__(self,regex=''):         self.w=[]         self.pos=[]         self.sw=[]         self.spos=[]         self.regex=regex         self.r=re.compile(regex)         self.stl=[]         self.tgl=[]              def map_con(self,begin,end):         self.index=[]         f=1         for i in range(len(self.d)):             mi=self.d[i][0]             ma=self.d[i][1]             if begin>=mi and begin<ma and f:                 self.index.append(i)                 f=0             elif end>ma and not f:                 self.index.append(i)             elif end<ma and not f:                 #self.index.append(i)                 f=1             elif not f:                 self.index.append(i)                 break         return self.index                  def n_gram_extract(self,line):         #w=nltk.word_tokenize(line.lower())         self.d={}         self.tag_dic={}         line=line.replace('-',' - ')         w1=nltk.word_tokenize(line)         tag=nltk.pos_tag(w1)         self.spos=[j for i,j in tag]         self.sw=[i.lower() for i in w1]         self.w=' '.join(self.sw)         self.pos=' '.join(self.spos)         pos=0         if not self.regex:             print 'No regex found for spliting'             return self.sw         for i,j in enumerate(self.spos):             l=pos+len(j)             self.d[i]=[pos,l]             pos=l+1         my_iter=self.r.finditer(self.pos)         self.stl=[]         self.tgl=[]         count = 0         for match in my_iter:             count += 1             ran=match.span()             #print ran,count             posi= self.map_con(ran[0],ran[1])             st=''             tg=''             for num in posi:                 st+=self.sw[num]+' '                 tg+=self.spos[num]+' '             st=st.strip()             tg=tg.strip()             self.stl.append(st)             self.tgl.append(tg)             self.tag_dic[st]=tg             #print st,tg         #print count          return self.tag_dic#self.stl#,tgl,self.tag_dic                  if __name__=='__main__':            s="""Fast Breeder Test Reactor is a 40 MWt/13.2 MWe sodium cooled, loop type, mixed carbide-fuelled reactor. Its main aim is to gain experience in the design, construction and operation of fast reactors including sodium systems and to serve as an irradiation facility for development of fuel and structural materials for future fast reactors. """     o=extract('(JJ NN)|(JJJJNN)|(JJ NN NN)|(JJ NN NN NN)|NN|(NN NN)|(NN NN NN)|(NN NN NN NN)|(NN JJ)|(NN NN JJ)|(NN JJ NN NN)')     ne=o.n_gram_extract(s)     print(ne)

Output:
{'development': 'NN', 'irradiation': 'NN', 'main aim': 'JJ NN', 'reactor': 'NN', 'sodium': 'NN', 'mwt/13.2': 'NN', 'experience': 'NN', 'facility': 'NN', 'construction': 'NN', 'design': 'NN', 'fast': 'JJ', 'mwe': 'NN', 'fuel': 'NN', 'loop type': 'JJ NN', 'operation': 'NN', 'structural': 'JJ', 'breeder test': 'JJ NN', 'systems': 'NNS'}

[nilamo]

What is even going on here?  That regex is just a bunch of groups of J's and N's.  So it shouldn't match anything in your text, right?

Is that the output you're currently getting, or what you want to be getting?  What's off about it?