Pattern matching with the vi editor

To learn about pattern matching, we will ensure that the pattern that we will search for is highlighted when the pattern searched for is found. The configuration file for vi is /etc/vimrc.In the vi editor, use the following commands for various options:

The following is an example of a regular expression for replacing Tom with David:

:1,$s/tom/David/g                // from line 1 to end ($), replace tom by David 
:1,$s/<[tT]om>/David/g   // start and end of word   <    > 

This is another example of a regular expression. Create the love.txt file, as follows:

Man has love for Art
World is full of love
Love makes world wonderful
love looove lve
love
Love love lover loves
I like "Unix" more than DOS
I love "Unix"/
I said I love "Unix"
I love "unix" a lot

Use the following commands for testing pattern-searching facilities: