Mastering Python Scripting for System Administrators

The sub() function

This is one of the most important functions of the re module. The sub() is used for replacing the re pattern with the specified replacement. It will replace all the occurrences of the re pattern with the replacement string. The syntax is as follows:

            re.sub(pattern, repl_str, string, count=0)

• pattern: The re pattern.
• repl_str: The replacement string.
• string: The main string.
• count: The number of occurrences to be replaced. The default value is 0, which means replacing all occurrences.

Now we are going to create a re_sub.py script and write the following content in it:

import restr_line = 'Peter Piper picked a peck of pickled peppers. How many pickled peppers did Peter Piper pick?'print("Original: ", str_line)p = re.sub('Peter', ...