Count the Number of matching characters in a pair of string in Python

We are given two strings. We need to find the count it of the characters in the first string which are also present in a second string.

With set

The set function gives us unique values all the elements in a string. We also use the the & operator which finds the common elements between the two given strings.

Example

 Live Demo

strA = 'Tutorials Point' uniq_strA = set(strA) # Given String print("Given String\n",strA) strB = 'aeio' uniq_strB = set(strB) # Given String print("Search character strings\n",strB) common_chars = uniq_strA & uniq_strB print("Count of matching characters are : ",len(common_chars))

Output

Running the above code gives us the following result −

Given String Tutorials Point Search character strings aeio Count of matching characters are : 3

With re.search

We use the search function from the re module. We use a count variable and keep incrementing it when the search result is true.

Example

 Live Demo

import re strA = 'Tutorials Point' # Given String print("Given String\n",strA) strB = 'aeio' # Given String print("Search character strings\n",strB) cnt = 0 for i in strA:    if re.search(i, strB):       cnt = cnt + 1 print("Count of matching characters are : ",cnt)

Output

Running the above code gives us the following result −

Given String Tutorials Point Search character strings aeio Count of matching characters are : 5