Ex replace command instance, ex replace instance

Ex replace command instance, ex replace instance

I. Overview

A configuration file contains the following content:

Jack_companya lucy_companyb jack lucy

You need to change it:

Jack_companya lucy_companyb

Ii. Operations

Step 1: Replace the underlined usernames, such as jack_companya, with uppercase

: % S/\ ([a-z] * _ [a-z] * \)/\ U \ 1/g

Step 2: delete the lower-case User Name

: % S/[a-z] * // g

Step 3: replace the upper-case username with the lower-case Username

% S/\ (. * \)/\ L \ 1