# Python | Ways to count number of substring in string

Given a string and a substring, write a Python program to find how many numbers of substring are there in the string (including overlapping cases). Let’s discuss a few methods below.

Method #1: Using `re.findall()`

 `# Python code to demonstrate  ` `# to count total number ` `# of substring in string ` ` `  `import` `re ` `# Initialising string ` `ini_str ``=` `"ababababa"` `sub_str ``=` `'aba'` ` `  `# Count count of substrings using re.findall ` `res ``=` `len``(re.findall(``'(?= aba)'``, ini_str)) ` ` `  `# Printing result ` `print``(``"Number of substrings"``, res) `

Output:

```Number of substrings 0
```

Method #2: Using `re.finditer()`

 `# Python code to demonstrate  ` `# to count total number ` `# of substring in string ` ` `  `import` `re ` `# Initialising string ` `ini_str ``=` `"ababababa"` `sub_str ``=` `'aba'` ` `  `# Count count of substrings using re.finditer ` `res ``=` `sum``(``1` `for` `_ ``in` `re.finditer(``'(?= aba)'``, ini_str)) ` ` `  `# Printing result ` `print``(``"Number of substrings"``, res) `

Output:

```Number of substrings 0
```

Method #3: Using `startswith()`

 `# Python code to demonstrate  ` `# to count total number ` `# of substring in string ` ` `  `# Initialising string ` `ini_str ``=` `"ababababa"` `sub_str ``=` `'aba'` ` `  `# Count count of substrings using startswith ` `res ``=` `sum``(``1` `for` `i ``in` `range``(``len``(ini_str))  ` `         ``if` `ini_str.startswith(``"aba"``, i)) ` ` `  `# Printing result ` `print``(``"Number of substrings"``, res) `

Output:

```Number of substrings 4
```

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