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So it will print the match(‘123’) and its position(5,8) Character Classes: Expressions In the second example, \d will match for exactly 3 digits.

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Regex python full#

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We use the uppercase letters from “A-Z” inside of a set to do this.įor the final pattern, we check for a special character. Next, make a pattern to check for an uppercase character. We use the lowercase letters from “a-z” inside of a set to check for this. Then, create a pattern that checks for a lower case character. PHONE_REGEX = r'(\d” to check that there is a minimum of 8 of them (with no maximum value specified). Return None if no position in the string matches the pattern.” – Python Docs “Scan through string looking for the first location where the regular expression pattern produces a match, and return a corresponding match object. The search operation has 2 arguments we’ll be using: To solve this problem, we’ll be using the regular expression operation, “ search” to find the pattern (phone number) in the text. Phone (bool): a valid phone number in the required format """ check text for phone number in either following format: Write a function that accepts a string and searches it for a valid phone number.Ī valid phone number may be one of the following:

Regex python code#

The code works! Great job 🙂 Question #2 – Find Valid Phone Number I’m sure you noticed using ranges in a set decreased the number of characters you need to type out. For example, “” means it will match all numbers from 0 to 9 and all lowercase and uppercase letters from a-z. In this case, we use the metacharacter “”, which contains a set of characters that will match any character inside of it. Next, we use a regex metacharacter (a character with a special meaning). This lets us use escape characters, or “\”, in our patterns followed by regex special characters. To make a regex pattern, we start the string with an ‘r’ to tell python to create a “raw string pattern”. The VOWELS_REGEX variable is, of course, used to find the vowels in the string. Print(disemvowel("Programming With Mosh Rocks!")) In python, RegEx uses the “re” class, so let’s be sure to import that into our code: If the pattern isn’t found, input_string is returned unchanged.” – Python Docs “ Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in input_string with replacement. The substitute operation has 3 arguments we’ll be using: re.sub(pattern, replacement, input_string) We can use the regular expression ‘ substitute‘ operation to replace all the vowels with a blank space. Our goal is to replace every vowel (lower and uppercase) with a blank space. We can use a Regular Expression (RegEx) to greatly reduce the complexity of the solution. However, programmers are smart folk – I’ll bet you can already tell me that this isn’t the most efficient solution. When I first began coding, my instinct for this solution would have been to create a temporary string, loop through the input string, and concatenate every letter that isn’t a vowel onto the temp string before returning it. """Removes all occurences of vowels from the string. Here is what the skeleton of the solution looks like: This doesn’t look too bad, does it? Let’s jump right in! Note: For this problem, ‘y’ is NOT considered a vowel. Your task is to write a function that takes a string argument and returns a new string with all vowels removed.įor example, the string “Hello World!” would become “ Hll Wrld”. Trolls are attacking your comment section!Ī common way to deal with this situation is to remove all of the vowels from the trolls’ comments, neutralizing the threat.

So, without further adieu, let’s begin! Question #1 – Disemvowel Trolls In this article, we will be using Regular Expressions to solve each problem. The solutions are written in python because it is arguably one of the easiest languages to master interview questions in – meaning you may have a higher chance of dominating the interview!

Regex python series#

Welcome to the first article in a series of interview questions and solutions in python! I will be walking through the solutions in detail, so you understand exactly what is going on. January 31st, 2022 Comments Interview Questions in Python – Regular Expressions