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    Use grep's extended regular expressions to find complex patterns

    grepgrep

    Learn to use grep's extended regular expressions to describe more complex patterns. The ? and + special characters describe optional patterns. The ? character matches zero or one instance of the preceding term, and the + character matches one or more instances of the preceding term. To use these characters, you'll need to either escape them with backslashes or turn on extended regular expressions with the -E flag.