Editing certain space in a line using Regular Expression

Question

Hello I have the txt file list:

asjd
gsgs
azda

I want to edit the 2nd spot on the line so it is such:

a-jd
g-gs
a-da

I have tried playing around with the \S reg expression but I am struggling. This is out of my knowledge. Thanks in advance.

Answer 1

Try the following find and replace, in regex mode:

Find:    ^(.).(.*)$
Replace: $1-$2

Demo