I have a text file, the following shows a sample of file contents:1234  A novel homeodomain-encoding gene is associated with a large CpG  island interrupted by the <category=Modifier>myotonic  dystrophy</category> unstable (CTG)n  repeat.   <category=SpecificDisease>Myotonic  dystrophy</category> (  <category=SpecificDisease>DM</category> ) is associated  with a ( CTG ) n trinucleotide repeat expansion in the 3-untranslated  region of a protein kinase-encoding gene , DMPK , which maps to  chromosome 19q13 . 3 . Characterisation of the expression of this gene  in patient tissues has thus far generated conflicting data on  alterations in the steady state levels of DMPK mRNA , and on the final  DMPK protein levels in the presence of the expansion . The  <category=Modifier>DM</category> region of chromosome 19  is gene rich , and it is possible that the repeat expansion may lead  to dysfunction of a number of transcription units in the vicinity ,  perhaps as a consequence of chromatin disruption . We have searched  for genes associated with a CpG island at the 3 end of DMPK .  Sequencing of this region shows that the island extends over 3 . 5 kb  and is interrupted by the ( CTG ) n repeat . Comparison of genomic  sequences downstream ( centromeric ) of the repeat in human and mouse  identified regions of significant homology . These correspond to exons  of a gene predicted to encode a homeodomain protein . RT-PCR analysis  shows that this gene , which we have called  <category=Modifier>DM</category> locus-associated  homeodomain protein ( DMAHP ) , is expressed in a number of human  tissues , including skeletal muscle , heart and brain .I need to extract what in between tags: for example,<category=SpecificDisease>Myotonic dystrophy</category>I need to extract Myotonic dystrophy and write to a new text file.
Extracting information between tags
text processing