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
Problem Formulation In Python’s interactive mode, each line is assumed to be an expression that is evaluated. The return value is provided to the user. Thus, if you evaluate a string expression or call a function or an operation that returns a string, the output will display quotes around the string to tell the user … Read more
What regular expressions can be used to match Bitcoin addresses? A regular expression for validating Bitcoin addresses must check that the string is 26-35 characters long, start with “1” or “3” or “bc1” consists of uppercase or lowercase alphabetic and numeric characters, and ensure it doesn’t contain ambiguous characters. Not allowed are the uppercase letter … Read more
Problem Formulation Given a string s. How to find the substring s’ between an opening and a closing parentheses? Consider the following examples: Input: ‘Learn Python (not C++)’ Output: ‘not C++’ Input: ‘function(a, b, c, d)’ Output: ‘a, b, c, d’ Input: ‘(a+(b+c))’ Output: ‘a+(b+c)’ Method 1: Slicing and str.find() The simplest way to extract … Read more
? Summary: This blog explores the steps to remove all non-alphabet characters from a given string. The ‘re’ module in Python provides regular expression operations, to process text. One uses these operations to manipulate text in strings. The compile() method in conjunction with the sub() method can remove all non-alphabet characters from a given string. Note: … Read more