Package Information:

Name: flex
Use: Fast Lexical Analyzer, generates Scanners (tokenizers)
URL: https://flex.sourceforge.io

Installation Steps:

1. Open Terminal using Spotlight search by pressing <command+space>. Type terminal and hit Enter key.
2. Now, run

   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

3. Install flex using brew

   brew install flex

flex is ready to use now!