January 2nd, 2013 
Jijo K Jose
Step 1
Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.
#!/usr/bin/python
#Author : Jijo K Jose
print "\n————————————\nChapter 22 – Regular Expression 5 \n————————————\n"
import re
in_str = raw_input("Enter a text : ")
se_str = raw_input("Enter search string : ")
re_str = raw_input("Enter replace string : ")
count = 10
reg1 = re.compile(se_str)
print "Result : ",reg1.sub(re_str,in_str,count)
print "\n———————————–\n"
#END
Step 2
Change file permission to executable using chmod command.
Step 3
Execute the python file.
