How to input a regex in string.replace?

Question

I need some help on declaring a regex. My inputs are like the following:

this is a paragraph with<[1> in between and then there are cases ..         


        

Answer 1

import os, sys, re, glob

pattern = re.compile(r"\<\[\d\>")
replacementStringMatchesPattern = "<[1>"

for infile in glob.glob(os.path.join(os.getcwd(), '*.txt')):
   for line in reader: 
      retline =  pattern.sub(replacementStringMatchesPattern, "", line)         
      sys.stdout.write(retline)
      print (retline)