Advanced Predefined Classes

Lesson 11 of 28 in Coddy's RegEx in Python course.

Here are some additional predefined character classes that are the complements of the common ones:

\D: Matches any non-digit character (equivalent to [^0-9]).
\W: Matches any non-word character (equivalent to [^a-zA-Z0-9_]).
\S: Matches any non-whitespace character (equivalent to [^ \t\n\r\f\v]).

import re

text = "Hello, world! Welcome to regex 101."
pattern = r"\W"

matches = re.findall(pattern, text)

print(matches)  # Output: [',', ' ', '!', ' ', ' ', ' ', ' ', '.']

In the above example, the pattern \W matches any non-word character in the string text.

Challenge

Easy

Write a function named find_non_digit_characters that takes a text string as input and returns a list of all non-digit characters found in the text.

Try it yourself

import re

def find_non_digit_characters(text):
    # Write code here

All lessons in RegEx in Python

1Introduction

Introduction

4Anchors and Quantifiers

Anchors Boundaries Quantifiers Repetitions

7Final Challenges

Extracting Hashtags Finding Email Addresses Valid Phone Numbers Finding Dates Capitalized Words

2re Library

findall search split sub

5Grouping and Advanced Patterns

Grouping Capturing Pipe Operator Alternation Lookaheads Lookbehinds

3Basic Pattern Syntax

Basic Metacharacters Literals Character Classes Ranges Common Predefined ClassesAdvanced Predefined Classes

6Advanced Techniques

Escape Metacharacters Escape Sequences

Practice on your own: Online Python compiler

Test a pattern on your own text: Regex Tester