How to check for strings between certain strings in unix scripting?

Question

String:

name@gmail.com

Checking for:

@
.com

My code

if [[ $word =~ \"@\" ]] 
then 
    if [[          


        

Answer 1

You can use a very very basic regex:

[[ $var =~ ^[a-z]+@[a-z]+\.[a-z]+$ ]]

It looks for a string being exactly like this:

at least one a-z char
@
at least one a-z char
.
at least one a-z char

It can get as complicated as you want, see for example Email check regular expression with bash script.

See in action

$ var="a@b.com"

$ [[ $var =~ ^[a-z]+@[a-z]+\.[a-z]+$ ]] && echo "kind of valid email"
kind of valid email

$ var="a@.com"
$ [[ $var =~ ^[a-z]+@[a-z]+\.[a-z]+$ ]] && echo "kind of valid email"
$