python lab (16/04/2024)

#Q1. python program to check if a string starts with the and end with spain use regex


import re

def check_string(input_string):
    pattern = r'^the.*spain$'
    if re.match(pattern, input_string, re.IGNORECASE):
        return True
    else:
        return False

test_string1 = input("Enter string: ")

print(check_string(test_string1))

#output:
Enter string: the spain
True
Enter string: the spain not
False


#Q. program to find all lowercase charcters aplhabetically between a and m, use regex
import re

def find_lower_chars(input_string):
    pattern = r'[a-m]'
    result = re.findall(pattern, input_string)
    return result

user_input = input("Enter a string: ")
lowercase_chars = find_lower_chars(user_input)
print("Lowercase characters between 'a' and 'm':", lowercase_chars)

#output:
Enter a string: The quick brown fox jumps over the lazy dog
Lowercase characters between 'a' and 'm': ['h', 'e', 'i', 'c', 'k', 'b', 'f', 'j', 'm', 'e', 'h', 'e', 'l', 'a', 'd', 'g']

#Q. program to search for the first white space character in the string


import re

txt = "The rain in Spain"
x = re.search("\s", txt)

print("The first white-space character is located in position:", x.start())

#Output:
The first white-space character is located in position: 3

#Q. program to split at each whitespace character using regex

import re

def split_at_whitespace(input_string):
    return re.split(r'\s+', input_string)

user_input = input("Enter a string: ")
result = split_at_whitespace(user_input)
print("Split at each whitespace character:", result)


#Output:
Enter a string: This is a demo input.
Split at each whitespace character: ['This', 'is', 'a', 'demo', 'input.']


#Q. replace every white space character with the number nine

import re

def replace_whitespace_with_nine(input_string):
    return re.sub(r'\s', '9', input_string)

user_input = input("Enter a string: ")
result = replace_whitespace_with_nine(user_input)
print("String with every whitespace character replaced with '9':", result)


#Output:
Enter a string: This is a demo input
String with every whitespace character replaced with '9': This9is9a9demo9inputp


#Q: check if email valid or not:
import re

def validate_email(email):
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    regex = re.compile(pattern)
    return bool(regex.match(email))

user_email = input("Enter your email address: ")

if validate_email(user_email):
    print("Valid email address!")
else:
    print("Invalid email address. Please enter a valid email.")


#Output:
Enter your email address: arijit@gmail.com
Valid email address!

Enter your email address: arijit@gmail
Invalid email address. Please enter a valid email.