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Python Regex: The 5 Exclusive Examples

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 Regular expressions (regex) are powerful tools for pattern matching and text manipulation in Python. Here are five Python regex examples with explanations: 01 Matching a Simple Pattern import re text = "Hello, World!" pattern = r"Hello" result = re.search(pattern, text) if result:     print("Pattern found:", result.group()) Output: Output: Pattern found: Hello This example searches for the pattern "Hello" in the text and prints it when found. 02 Matching Multiple Patterns import re text = "The quick brown fox jumps over the lazy dog." patterns = [r"fox", r"dog"] for pattern in patterns:     if re.search(pattern, text):         print(f"Pattern '{pattern}' found.") Output: Pattern 'fox' found. Pattern 'dog' found. It searches for both "fox" and "dog" patterns in the text and prints when they are found. 03 Matching Any Digit   import re text = "The price of the
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2 User Input Python Sample Programs

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Here are the Python programs that work on taking user input and giving responses to the user. These are also called interactive programs. 


Python enables you to read user input from the command line via the input() function or the raw_input() function. Typically, you assign user input to a variable containing all characters that users enter from the keyboard. User input terminates when users press the <return> key (included with the input characters).


User input programs


#1 User input sample program


The following program takes input and replies if the given input value is a string or number.


my_input = input("Enter something: ") 
try: 
    x = 0 + eval(my_input) 
    print('You entered the number:', my_input) 
except: 
    print(userInput,'is a string')


Output


Enter something: 

100

You entered the number: 100

** Process exited - Return Code: 0 **

Press Enter to exit terminal. 


#2 User input sample program


The following program takes two inputs from the user and calculates the sum.


sum = 0
msg = 'Enter a number:'
val1 = input(msg)

try:
  sum = sum + eval(val1)
except:
  print(val1,'is a string')

msg = 'Enter a number:'
val2 = input(msg)

try:
  sum = sum + eval(val2)
except:
  print(val2,'is a string')

print('The sum of',val1,'and',val2,'is',sum)


Output

Enter a number:
100
Enter a number:
200
The sum of 100 and 200 is 300


** Process exited - Return Code: 0 **
Press Enter to exit terminal


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