learning regex isn't easy :-)

hi all,

so, I'm new to regex, trying to understand and i admit i'm lost.

here's what i need right now;

i have a list of string where i wish to extract the email address of users, each line looks like this:

DisplayName;Surname;Givenname;Mail;Company

which gives me something like:

$line = 'jsmith;john;smith;john.smith@someemail.com;acme'

since I'm new and not sure how this work, i do these to test and learn, and the results. now i'm trying to understand why the last 2 shown here are failing.

$line -match '\w+' = True
$line -match '\w+;' = true
$line -math '\w+;\w+;' = true
$line -match '\w+;\w+;\w+' = true
$line -match '\w+;\w+;\w+;' = false
$line -match '\w+;\w+;\w+;\.*' = false

at first i thought that this regex would give me the email but it fails.

$regex = '\w+;\w+;\w+;(\w+@\w+);\w+'

thanks for helping me.