Ruby regex gsub a line in a text file

Question

I need to match a line in an inputted text file string and wrap that captured line with a character for example.

For example imagine a text file as such:

<         


        

Answer 1

Chomp Line Endings

Your lines probably have newline characters. You need to handle this one way or another. For example, this works fine for me:

$ ruby -ne 'puts "X#{$_.chomp}X"' /tmp/corpus
XtestX
XfooX
XtestX
XbarX