Python String rfind() method

The string. rfind() method in Python returns the highest index in the string if the substring sub is found else it returns -1 if the substring is not found.

Syntax

string.rfind(sub [,start [,end]]) 

Parameter

sub: This parameter represents the value to search for.

start( Optional): This parameter signifies the substring from where the search is to start and its

default value is 0.

end: This parameter signifies the substring from where to end the search and its default value is

the end of the string.

Return

This method returns the highest index in the string is the substring sub is found else it returns -1 if the substring is not found. 

Example 1

 # Python program explaining
 # the string.rfind() method
 # initializing the String
 string ="She sells sea shells by the sea shore"
 # finding the highest index of substring 'sea' in the string 
 index = string.rfind("sea")
 # printing the index
 print("The index of 'sea':",index) 

Output

The index of 'sea': 28

Example 2

 # Python program explaining
 # the string.rfind() method
 # initializing the String
 string ="She sells seashells by the sea shore"
 # finding the highest index of substring 'by' in the string 
 result = string.rfind('by')
 if  (result != -1):
   print("Highest index where 'by' occurs:", result)
 else:
   print("Doesn't contain substring") 

Output

Highest index where 'by' occurs: 20

Example 3

 # Python program explaining
 # the string.rfind() method
 # initializing the String
 string ="She sells seashells by the sea shore"
 # Substring 'se' is searched in the specified string
 print(string.rfind('se', 10))
 # Substring 'h' searched 
 print(string.rfind('h', 2))
 # Substring 's' is searched
 print(string.rfind('s', 10, -1))
 # Substring 'hi' searched 
 # will return -1 as the substring 'hi' is not present 
 print(string.rfind('hi')) 

Output

 27
 32
 31
 -1