Problem Formulation Say, you want to find a regex pattern in a given string. You know the pattern exists in the string. You use the re.match(pattern, string) function to find the match object where the pattern matches in the string. 💬 Problem: The Python regular expression pattern is not found in the string. The pattern … Read more
Today, I stumbled upon this beautiful regex problem: Given are a multi-line string and a regex pattern. How to find all lines that do NOT contain the regex pattern? I’ll give you a short answer and a long answer. The short answer: Use the pattern ‘((?!regex).)*’ to match all lines that do not contain regex … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to extract numbers from a string in Python. To make it more fun, we have the following running scenario: This article references an Albanian proverb written by Driton Selmani in 2012. We will leave the interpretation up to you. 💬 Question: How would we … Read more
Summary: Use the string literal syntax f”{number:.nf}” to suppress the scientific notation of a number to its floating-point representation. Problem Formulation: How will you suppress a number represented in scientific notation by default to a floating-point value? Note: Generally, Python represents huge floating-point numbers or very small floating-point numbers in their scientific form. Scientific notation … Read more
The question reveals that there may be some gap in understanding the basics of Python’s regular expression library. How to match an exact word or string using a regular expression in Python? So if you’re an impatient person, here’s the short answer: To match an exact string ‘hello’ partially in ‘hello world’, use the simple … Read more
Para contar un patrón de expresión regular varias veces en una cadena dada, usa el método len(re.findall(pattern, string)) que devuelve el número de subcadenas coincidentes o len([*re.finditer(pattern, text)]) que desempaqueta todas las subcadenas coincidentes en una lista y también devuelve la longitud de la misma. Hace unas horas, escribí una expresión regular en Python que … Read more
BeautifulSoup is a library used for parsing web pages. As the library is simple to access and use, it is extensively used by the developers for Web Scraping activities. If the webpage is in the HTML format, we can parse the webpage using an HTML parser. After parsing the document, we can filter only the … Read more
Annual Income How much does a Perl Developer make per year? The average annual income of a Perl Developer is $98,000 according to PayScale (source). Let’s have a look at the hourly rate of Perl Developers next! Hourly Rate Perl Developers are well-paid on freelancing platforms such as Upwork or Fiverr. Related Article: What’s the … Read more
Problem Formulation Given a string, a substring, and a replacement string in Python. String s Substring sub Replacement string repl How to find and replace the last occurrence of sub with the replacement repl in the Python string s? Let’s have a look at a couple of examples to thoroughly understand the problem: Example 1: … Read more
Problem Formulation Given a string and a substring in Python. How to find the index of the last occurrence of the substring in Python? Let’s have a look at a couple of examples to thoroughly understand the problem: Example 1: string = ‘fifi’ substring = ‘fi’ result: 2 Example 2: string = ‘hello’ substring = … Read more
Question Recap the following regular expression concepts (more details in the article below): The dot character . in regular expressions matches any character excluding the newline character. For example, the pattern ‘c.t’ will match the strings ‘cat’, ‘cut’, or ‘czt’. The character class [ ] is a set of characters: if you use it in … Read more
We hear more and more about natural language processing. In today’s world, the amount of text content produced is growing exponentially. In order to process a text with a machine learning model, it is important to find certain information and numerical features about the text. What Are N-Grams? N-Grams are one of the tools to … Read more