Python Regular Expressions Cheat Sheet

The Python Regular Expressions Cheat Sheet is a document that provides a quick reference guide for writing and understanding regular expressions in Python. It includes various syntax and pattern examples that can be used for pattern matching and text manipulation tasks in Python programming.

FAQ

Q: What is a regular expression?
A: A regular expression is a sequence of characters that forms a search pattern.

Q: How do I import the regular expressions module in Python?
A: You can import the re module by using the 'import re' statement.

Q: How do I search for a pattern in a string using regular expressions?
A: You can use the re.search() function to search for a pattern in a string.

Q: What is the difference between re.match() and re.search()?
A: re.match() searches for the pattern only at the beginning of the string, while re.search() searches for the pattern anywhere in the string.

Q: How do I replace a pattern in a string using regular expressions?
A: You can use the re.sub() function to replace a pattern in a string.

Q: What are some common metacharacters in regular expressions?
A: Some common metacharacters in regular expressions include '.', '*', '+', '?', '[', ']', '{', '}', '(', ')', '|', '^', and '$'.

Q: What does the '.' metacharacter represent in regular expressions?
A: The '.' metacharacter represents any character except a newline character.

Q: What does the '' metacharacter represent in regular expressions?
A: The '' metacharacter represents zero or more occurrences of the preceding element.

Q: What does the '+' metacharacter represent in regular expressions?
A: The '+' metacharacter represents one or more occurrences of the preceding element.

Q: What does the '?' metacharacter represent in regular expressions?
A: The '?' metacharacter represents zero or one occurrence of the preceding element.