Python Find Substring In String, Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Sep 10, 2025 · Sort a list Convert Image to String and vice-versa Iter Over words of a String Convert case of elements in a list of Strings Sort list of dates given as Strings Pad or fill a string by a variable using f-string Convert string to DateTime and vice-versa Index and Slice Strings Split string in groups of n consecutive characters Programs on SubString Can you solve this real interview question? Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without duplicate characters. In this tutorial, you'll learn how to use the Python string index() method to get the lowest index of a substring in a string. find() and string. Note: Every string method in Python does not change the original string instead returns a new string with the changed attributes. Python String find () method with Examples on capitalize (), center (), count (), encode (), find (), format (), index (), join (), lower (), ljust (), isupper (), istitle (), isspace (), isprintable (), isnumeric (), islower () etc. Learn how to use the in operator, lower() method, count() method, index() method, and regex to find substrings in Python strings. See code examples, answers and comments from Python experts and users. Oct 18, 2024 · The find () method in Python is a versatile tool for locating substrings within strings. Dec 20, 2025 · The operator. finditer() to find all matches. Jan 28, 2025 · Learn how to find the last occurrence of a substring in a string using Python with methods like rfind (), rindex (), and regular expressions. May 25, 2023 · This succinct, practical article will walk you through several different ways to check whether a string contains a specific substring in Python. In my opinion, you will understand and memorize better the Python string slicing notation if you look at it the following way (read on). Includes examples. Note that "bca" and "cab" are also correct answers. See examples, syntax, parameters, and differences with in and index methods. See examples, syntax, and comparison with in operator. Learn how to use the find() method to locate a substring in a string and return its index. Mar 31, 2026 · Practical patterns for finding, counting, and replacing substrings in modern Python. For example, # create a string using double quotes string1 = "Python programming" # create a string using single quotes string1 = 'Python programming' Here, we have created a The index() method is similar to the find () method for strings. Basically, it helps us to find out if the specified substring is present in the input string. It allows you to search with precision by specifying a range and provides a straightforward way to determine if a substring exists. Sep 9, 2025 · Group Sublists by another List Sort String by Custom Integer Substrings Finding strings with given substring in List Remove all values from a list present in another List Print all sublists of a List Coding Problems on Substring and Sublists Reverse Array in Groups Maximum Product Subarray Split array in three equal sum subarrays Longest Feb 23, 2026 · Learn how to count characters in a string in Python using len(), count(), loops, and collections for effective text analysis and data processing. The python string index() method is used to return the index of the input string where the substring is found. Jul 25, 2022 · Learn how to use the built-in find() method in Python to locate the index of a substring inside a string. For example, "hello" is a string containing a sequence of characters 'h', 'e', 'l', 'l', and 'o'. See examples, code snippets, and tips for data analysis. Learn how to use the find() method to locate the first occurrence of a value in a string. Let's work with the following string . It provides the same result as the in operator but belongs to Python’s operator module, making it useful in functional programming contexts. contains () function checks for substring presence in a string programmatically. In Python, a string is a sequence of characters. Jul 23, 2025 · Python string methods is a collection of in-built Python functions that operates on strings. rfind() to get the index of a substring in a string, or how to use regular expressions and re. Learn how to use string. The only difference is that find () method returns -1 if the substring is not found, whereas index() throws an exception. We use single quotes or double quotes to represent a string in Python. I assume you already have some basic understanding of the programming language, so I won’t waste your time by praising how powerful Python is or talking about its prolonged history. 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