.. _regex:

Regular Expressions
------------------------

:title:`Linux for Programmers and Users`, Appendex A.1, A.2.

Regular expressions provide an expressive syntax for use with the shell and
a variety of commands, especially commands used to filter data.

.. figure:: regex.png
   :align: center

.. figure:: regex2.png
   :align: center

   Regular Expression Operators and their Support by Unix Tools 

.. figure:: regex_examples.png
   :align: center

   Examples of Regular Expression Using :command:`vi`