Python program to count number of substring present in string

Suppose we have a string s and a substring t. We have to count how many times t occurs in s.

So, if the input is like s = "abaabcaabababaab", t = "aab", then the output will be 3 because the substrings are ab(aab)c(aab)abab(aab).

To solve this, we will follow these steps −

• cnt := 0
• for i in range 0 to (size of s - size of t), do
  • if substring of s[from index i to i + size of t - 1] is same as t, then
    • cnt := cnt + 1
• return cnt

Example

Let us see the following implementation to get better understanding

def solve(s, t):
   cnt = 0
   for i in range(0, len(s) - len(t) + 1):
      if s[i:i + len(t)] == t:
         cnt = cnt + 1
   return cnt

s = "abaabcaabababaab"
t = "aab"
print(solve(s, t))

Input

"abaabcaabababaab", "aab"

Output

3

Arnab Chakraborty

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Updated on: 11-Oct-2021

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