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Feature: Collating Elements | regexp-features

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A Collating Element is one or more characters that collate as a single unit.

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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 the collating element col if col is treated as a single collating unit in the current locale. Example: [[.ae.]-c] matches a single character in the range “ae”-“c”. col may also be specified by a symbolic name.

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• Character Classes
• Posix Character Classes
• Negated Posix Character Classes
• 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

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