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i need to know what's the meaning in pattern defintion in c#?

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clarified that by "pattern definition" he means the patterns used when building a C# compiler (and earlier asked whether this was about design patterns). In compiler work "patterns" normally refer to two things: the lexical token patterns (regular-expression style rules the lexer uses) and the grammar productions (BNF/EBNF) the parser consumes. A practical compiler workflow is lexing → parsing → semantic analysis → codegen/IR.

For lexing, define token classes: keywords, identifiers, literals, operators, punctuation, comments and whitespace. Simple, illustrative token patterns (very simplified) are IDENTIFIER: [A-Za-z_][A-Za-z0-9_]* and INT_LITERAL: [0-9]+ — these omit Unicode identifiers and full numeric/string formats used by C#. Pay special attention to verbatim strings (@"..."), escape sequences, preprocessor directives and @-prefixed identifiers. For parsing, write an EBNF grammar for your target subset and be aware of common ambiguities (for example generics angle-bracket vs. shift operators) that may require lookahead or parser design choices. Decide early whether to hand-roll lexer/parser or use a generator.

For references and practical starting points consult the authoritative spec and real implementations. The C# language specification is the definitive reference (C# language specification). For a production-level implementation study Roslyn (dotnet/roslyn). If you want a parser generator route, inspect ANTLR's C# grammar (grammars-v4 csharp). Start by implementing a small, well-tested subset and expand from there.

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Member Avatar for Jens

Do you mean design patterns? I don't think I get the question.

Member Avatar for Genuis Man

no i mean pattern defintion for making compiler for c#

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