Feature: Equivalence Classes

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An Equivalence Class matches any character or collating element with the same primary sort key as the provided collating element.

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.

• [[=col=]] — Matches any character with the same primary sort key as col. Example: [[=a=]] matches a, À, Á, Â, Ã, Ä, Å, A, à, á, â, etc.

Engines

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

See Also

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• Character Classes
• Posix Character Classes
• Negated Posix Character Classes
• Collating Elements
• 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