Use grep's extended regular expressions to find complex patterns

Bonnie Eisenman
InstructorBonnie Eisenman

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Published 5 years ago
Updated 3 years ago

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.

Miguel Carvajal
Miguel Carvajal
~ 3 years ago

I dont understand why we need to scape these characters and not the single dot "." character?