In modern compilers two approaches are widely used to implement a lexer/scanner/tokenizer: the hand-written approach and the automatic lexer generator approach.
| Compiler | Lexer/scanner/tokenizer implementation | Source |
| Cray Chapel 1.7.0 | Flex | chaplel/compiler/parser/chapel.lex |
| IBM X10 2.3.1 | LPG (LALR parser generator) | x10/x10.compiler/src/x10/parser/X10Lexer.java |
| GCC 4.8.1 | handwritten | gcc/gcc/c-family/c-lex.c |
| Clang 3.3 | handwritten | cfe/lib/Lex/Lexer.cpp |
| PathScale EkoPath 4 | handwritten - base on GCC frontend | |
| Open64 5.0 | handwritten - based on GCC frontend |
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