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Searching in Python Forensics
Vicky Bal
a year ago
Table of Contents
- What is Searching in forensics?
- Examples
1. How to search for a string in text files
2. String exist in the file or not
3. First string contains the second one or not
What is Searching in forensics?
One of the most important parts of forensic investigation is the search, which usually boils down to finding out who is carrying out the evidence.
Search is a key word of the message, with the help of this key word we can look for evidence. We can do our tasks with some knowledge and experience knowing what to look for in a file along with the files that have been deleted.
Python provides us with a mechanism built into a standard library to carry out our search task. With the help of the search we find answers to questions like “who”, “what”, “where” and “when” and so on.
Let’s
take an example
Examples
1. How to search for a string in text files
We search for a character string line by line. If the string is found, we output that string and the line number.
insideaiml.txt
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# opening a text file
text_file = open("insideaiml.txt", "r")
# setting flag and index to 0
flag = 0
index = 0
keyword = 'join'
# Loop through the file line by line
for line in text_file:
index += 1
# checking string is present in line or not
if keyword in line:
flag = 1
break
# checking condition for string found or not
if flag == 0:
print('String', text_file, 'Not Found')
else:
print('String', text_file, 'Found In Line', index)
# closing text file
text_file.close() Output
String <_io.TextIOWrapper name='insideaiml.txt' mode='r' encoding='cp1252'>
Found In Line 22. String exist in the file or not
We only exist a string in the file or not.
keyword = 'AIML'
# opening a text file
text_file = open("insideaiml.txt", "r")
# read file content
read_file = text_file.read()
# checking condition for string found or not
if keyword in read_file:
print('String', keyword, 'Found In File')
else:
print('String', keyword, 'Not Found')
# closing a file
text_file.close() Output
String AIML Found In File3. First string contains the second one or not
In the example take taken here, we have taken
two strings and used find function to check whether the first string contains
the second one or not.
# Searching a particular word from a given string
str1 = "This is a InsideAIML. How may I help you"
str2 = "InsideAIML"
print(str1.find(str2))
print(str1.find(str2, 10))
print(str1.find(str2, 40))
The above program output-
10
10
-1
Python
provides a function “find” which helps us to search a message or a
paragraph.
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