Python String rfind() Method - Coding

Python String rfind() method returns the rightmost index of the substring if found in the given string. If not found then it returns -1.

Python String rfind() Method Syntax

Syntax: str.rfind(sub, start, end)

Parameters:

sub: It’s the substring that needs to be searched in the given string.

start: Starting position where the sub needs to be checked within the string.

end: Ending position where suffix needs to be checked within the string.

Note: If start and end indexes are not provided then, by default it takes 0 and length-1 as starting and ending indexes where ending indexes are not included in our search.

Return: Returns the right-most index of the substring if it is found in the given string; if not found, then it returns -1.

Python String rfind() Method Example

Python3

string = "GeeksForGeeks"
print(string.rfind("Geeks"))

Output:

Example 1: Basic usages of Python String find() Method

Python3

word = 'geeks for geeks'
 
# Returns highest index of the substring
result = word.rfind('geeks')
print ("Substring 'geeks' found at index :", result )
 
result = word.rfind('for')
print ("Substring 'for' found at index :", result )
 
word = 'CatBatSatMatGate'
 
# Returns highest index of the substring
result = word.rfind('ate')
print("Substring 'ate' found at index :", result)

Output:

Substring 'geeks' found at index : 10
Substring 'for' found at index : 6
Substring 'ate' found at index : 13

Example 2: Using Python String rfind() Method with given start and end position inside String

If we pass the start and end parameters to the Python String rfind() Method, it will search for the substring in the portion of the String from its right side.

Python3

# Python program to demonstrate working of rfind()
# in a sub-string
word = 'geeks for geeks'
 
# Substring is searched in 'eeks for geeks'
print(word.rfind('ge', 2))
 
# Substring is searched in 'eeks for geeks' 
print(word.rfind('geeks', 2))
 
# Substring is searched in 'eeks for geeks' 
print(word.rfind('geeks ', 2))
 
# Substring is searched in 's for g'
print(word.rfind('for ', 4, 11))
 
# finding substring using -ve indexing
print(word.rfind('geeks', -5))

Output:

Example 3: Practical Application

Here, we check one email address and the Top Level Domain (TLD) matching our necessary condition. Then we print, “Email matched” else “Email not matched”, followed by the TLD String. Even if this email address contains a “.com” substring, rfind() helped to extract the TLD string more efficiently.

Python3

email = '[email protected]'
last_dot_pos = email.rfind('.', 1)
tld_string = email[last_dot_pos:]
 
if tld_string == ".com":
  print("Email matched")
else:
  print("Email not matched, tld:", tld_string)

Output:

Email not matched, tld: .xyz

Reffered: https://www.geeksforgeeks.org

Python

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