Regular Expressions Cheat Sheet - Pink

FAQ

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

Q: How are regular expressions used?
A: Regular expressions are used to perform pattern matching and search operations on strings.

Q: What are some basic metacharacters used in regular expressions?
A: Some basic metacharacters used in regular expressions include . (dot), * (asterisk), + (plus), | (pipe), ^ (caret), and $ (dollar sign).

Q: What does the . (dot) metacharacter represent in a regular expression?
A: The . (dot) metacharacter represents any single character except a newline character.

Q: What does the * (asterisk) metacharacter represent in a regular expression?
A: The * (asterisk) metacharacter represents zero or more occurrences of the preceding character or group.

Q: What does the + (plus) metacharacter represent in a regular expression?
A: The + (plus) metacharacter represents one or more occurrences of the preceding character or group.

Q: What does the | (pipe) metacharacter represent in a regular expression?
A: The | (pipe) metacharacter represents either the pattern before or after it.

Q: What does the ^ (caret) metacharacter represent in a regular expression?
A: The ^ (caret) metacharacter represents the start of a string.

Q: What does the $ (dollar sign) metacharacter represent in a regular expression?
A: The $ (dollar sign) metacharacter represents the end of a string.

Q: What are some commonly used quantifiers in regular expressions?
A: Some commonly used quantifiers in regular expressions include * (zero or more), + (one or more), ? (zero or one), and {n} (exactly n occurrences).