LPI Linux Essentials Study Guide by Christine Bresnahan & Richard Blum

Author:Christine Bresnahan & Richard Blum
Language: eng
Format: epub
ISBN: 9781119657729
Publisher: Wiley
Published: 2019-12-30T15:00:00+00:00

Whether you use basic or extended regular expressions depends on which form the program supports. For programs such as grep that support both, you can use either; which you choose is mostly a matter of personal preference. Note that a regular expression that includes characters associated with extended regular expressions will be interpreted differently depending on which type you’re using. Thus, it’s important to know which type of regular expression a program supports or how to select which type to use if the program supports both types.

Regular expression rules can be confusing, particularly when you’re first introduced to them. Some examples of their use, in the context of the programs that use them, will help. The next section provides such examples, with reference to the grep program.

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