In this article, we will see the concept of B-regular expressions in Python. Regular expressions (regex) are a useful tool for matching patterns in strings. In Python, the re module helps you to work with regex patterns. What is a B Regular Expression? A 'B' regular expression is a type of regex that searches and matches particular patterns within a string. For example, it can be used to find out whether a string starts or ends with a given letter or whether it matches the pattern's set criteria. Use the re Module For using regular expressions in Python, you need ... Read More

The re module provides tools while working with Python's regular expression (regex), which allows us to search for any specific pattern within the strings. Using the 're' module provides two functions named match() and search(),  which accept a pattern (regular expression) and return True or False. The match() function returns 'None' if no pattern is detected, or it returns the match in the form of an object (in case of a match). In addition to these, we can also use the fullmatch() function to get a boolean result from a regular expression. ... Read More

Regular expressions are a useful tool for searching and manipulating strings in Python. Among the several patterns and methods available, the [d+] expression is used to match one or more digits in a string. In this article, we will go over the [d+] regular expression pattern, the way it is used, and five code examples with step-by-step explanations to help you understand and apply it to your Python projects. Understanding the [d+] Pattern Before we see the code examples, let us first understand the [d+] pattern. So basically [d+] is a combination of two elements - ... Read More

By default, Python regular expressions (regex) look for case-sensitive matches. That is, the terms "apple" and "Apple" are not synonyms. But sometimes we want to search without consideration for uppercase or lowercase. This is referred to as a case-insensitive match. This chapter teaches you how to create case-insensitive regexes in Python without using re.compile(). What is a Regular Expression? A regular expression (regex) is a pattern that enables you to find strings like - Emails Phone Numbers Names Or any pattern. To interact with regular expressions, we use the Python built-in module re. Import the re Module Before ... Read More

To extract decimal numbers from a string in Python, regular expressions are used. A regular expression is a group of characters that allows you to use a search pattern to find a string or a set of strings. RegEx is another name for regular expressions. The re module in Python is used to work with regular expressions. In this article, we will learn how to extract decimal numbers from a string in Python using regular expressions. To retrieve non-digit characters from a string, we use the following regular expression - \d+\.\d+ Where, \d returns a match where the string contains ... Read More

In Python, a list is an ordered sequence that can hold several object types, such as integers, characters, or floats. In this article, we will show you how to check if the given input list is empty or NOT using Python. Below are the 5 methods to accomplish this task - Using not operator Using len() function By Comparing with an Empty List Using __len__() Method Using NumPy Module Assume we have taken an empty list. We will check if the input list is empty or not and return some random message for acknowledgment using different methods as ... Read More

A nested list is a list that has lists as elements. For example: [[1, 2, 3], [4, 5, 6], [7, 8, 9]] is a nested list as it has 3 lists ([1, 2, 3], [4, 5, 6], and [7, 8, 9]) as its elements. To flatten a list of lists (nested list), i.e., to convert a 2D list into a 1D list, there are different ways such as Nested for loop, List Comprehension, Built-in Functions, or by importing libraries in Python. In this article, we will discuss the above methods to flatten a list in Python. Using for loops For ... Read More

Python includes a built-in package i.e random module for generating random numbers. In this article, we will show you how to generate random numbers in python using different methods - Using random.seed() Method Using random.randrange() Method Using random.randint() Method ... Read More

Python is not a "statically typed" programming language. We do not need to define variables or their types before utilizing them. Once we initially assign a value to a variable, it is said to be created. Each variable is assigned with a memory location. The assignment operator (=) assigns the value provided to right to the variable name which is at its left. The syntax of the assignment operator is shown below - var_name = value Example of Assignment Operator The following is an example that shows the usage of the assignment operator - Name = 'Tutorialspoint' In ... Read More

In Python, lists are a useful way to store multiple elements in a single variable. To assign values to each entry in a list, loops are often needed. This strategy simplifies the process and improves the clarity of your code. This chapter will look at how to assign values to variables in a list using different loop types, using basic examples. Using Simple Loop Iterations In this method, we use the for loop to append elements to the lists. When we do not enter any element into the list and stop appending, then we just press the Enter key. To ... Read More