Hyphen (-) and PS

PowerShell Help
1

Hi, is there any restrictions on using the hyphen in PS?

I am importing records from windows firewall

import-csv -Path $FirewallLog -Delimiter " " -Header Date, Time, Action, Protocol, src-ip, dst-ip, srcport......
when I try to assign for example
$mySrc = $_.src-ip

I get a suiggly red line under src-ip. I tried the tick symbol to escape but it did not work

$mySrc = $_.src`-ip

Thanks for your help

2 
$mySrc = $_.'src-ip'

or

$mySrc = $_."src-ip"
3

Lovely, it is working like a charm, thanks