lex
Computer program
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Lex is a computer program that generates lexical analyzers. It is commonly used with the yacc parser generator and is the standard lexical analyzer generator on many Unix and Unix-like systems. An equivalent tool is specified as part of the POSIX... Wikipedia
Programming language: C
Initial release: 1975; 49 years ago
Operating system: Unix, Unix-like, Plan 9
Original author(s): Mike Lesk, Eric Schmidt