#http://codehangar.io/smiple-log-and-file-processing-in-python/ #https://github.com/codehangar/python-log-parse-example #above are the same import os import re # Regex used to match relevant loglines (in this case, a specific IP address) line_regex = re.compile(r".*fwd=\"12.34.56.78\".*$") # Output file, where the matched loglines will be copied to output_filename = os.path.normpath("parsed_lines.log") #made change for wroking on windows # Overwrites the file, ensure we're starting out with a blank file with open(output_filename, "w") as out_file: out_file.write("") # Open output file in 'append' mode with open(output_filename, "a") as out_file: # Open input file in 'read' mode with open("test_log.log", "r") as in_file: # Loop over each log line for line in in_file: # If log line matches our regex, print to console, and output file if (line_regex.search(line)): print line out_file.write(line)