Python Regular Expressions Quiz

Regular Expressions (RegEx)

• A regular expression (RegEx) is a sequence of characters that forms a search pattern, used to match, locate, and manage text patterns in strings.

Common Uses of Regular Expressions

• Validating input data to ensure it conforms to a specific format
• Searching and replacing text patterns in a string
• Extracting data from a large dataset
• Parsing text data to extract specific information

Metacharacters in Regular Expressions

• Metacharacters are special characters in RegEx that have a unique meaning and are used to specify patterns
• Common metacharacters include . , *, +, ?, {, }, [, ], |, (, )

Forming a Regular Expression

• A regular expression can be formed by combining literal characters, metacharacters, and character classes to define a pattern
• The pattern can be used to search, validate, or extract data from a string

Metacharacter '[]'

• The metacharacter [] represents a character class, which matches any single character within the brackets
• It is used to specify a set of characters that can be matched in a string
• For example, [abc] matches any of the characters 'a', 'b', or 'c'