Feature: Character Classes

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A Character Class is an Atom that specifies a set of characters to match a single character in the set.

Syntax

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NOTE: The following syntax is an example based on some of the supported engines. For specific engine support, see Engines.

• […] — Where … is one or more single characters or character class escapes, excluding ^ at the start and - between two entries in the set. Matches a character in the set. Example: [abc] matches a, b, or c.
• [^…] — Where … is one or more single characters or character class escapes, excluding - between two entries in the set. Matches any character not in the set. Example: [^abc] matches d, e, or f, etc., but not a, b, or c.
• [a-z] — Where a and z are single characters or character escapes. Matches any character in the range between a and z (inclusive). Example: [a-c] matches a, b, or c, but not d.

Engines

Engine	Supported
Perl	✔
PCRE	✔
Boost.Regex	✔
.NET	✔
Oniguruma	✔
Hyperscan	✔
ICU	✔
Glib/GRegex	✔
ECMAScript	✔

See Also

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• Posix Character Classes
• Negated Posix Character Classes
• Collating Elements
• Equivalence Classes
• Character Class Escapes
• Line Endings Escape
• Character Property Escapes
• Character Class Nested Set
• Character Class Intersection
• Character Class Union
• Character Class Subtraction
• Character Class Symmetric Difference
• Character Class Complement