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For students and developers working on compiler design or pattern-matching programs, Flex is a tool that generates C/C++ code from lexical rules. Download flex-2.5.4a-1.exe (GnuWin) - SourceForge flex download for windows 10
Download GnuWin flex-2.5.4a-1.exe. Provides native Win32 open source ports and utilities. SourceForge Install ChromeOS Flex: Fast, Secure OS for PCs & Macs Finding the right "Flex" download for Windows 10