python string contains

in operator

• We Can use the keyword in.
• It's a build-in python functionality
• Using in is Efficient, Clean Readable way

			
					string = "I Love Tom & Jerry"

print("Tom" in string)
# True

			
	

			
	
			

		
	

python string contains substring

In the Above Example, Tom is the substring in our original string string, So the result is true.If you search for a substring that does not exist in original string, it returns `false `.

string contains python

			
					string = "I Love Tom & Jerry"

print("Puma" in string)
# False

			
	

			
	
			

		
	

.find() Method

• We can use the function find.
• Basically, it's a String method.

			
					string = "I Love Tom & Jerry"

print(string.find("Jerry"))
# 13

			
	

			
	
			

		
	

• It Doesn't return boolean & it returns the index
• If we search for a string that doesn't exist, it returns -1.
• It always returns the index of that substring or -1 if that doesn't exist
• We can specify the start index & stop index

			
					string = "I Love Tom & Jerry"

print(string.find("jbjb"))
# -1

			
	

			
	
			

		
	

re - python regex

• Uses the regular expression package re.
• This is Advanced Method for Advanced functionality

python findall

			
					import re

string = "I Love Tom & Jerry.Tom loves Scooby"

print(re.findall("Tom",string))

# ['Tom', 'Tom']

			
	

			
	
			

		
	

• We found all occurrences string Tom in our original string
• This is the most PowerFul Function
• We can also use the search method from package re, It also gives an index of the string

python search

			
					import re

string = "I Love Tom & Jerry.Tom loves Scooby"

print(re.search("Tom",string))

# <re.Match object; span=(7, 10), match='Tom'>

			
	

			
	
			

		
	

• Yes, It gives a start index & a stop index. But it doesn't find all the strings.