$file="file.txt"
foreach ($i in (gc $file) -match "(\w+=) -replace "\w+=","") {[void]$foreach.movenext();$i+";"+$foreach.current }

$file="file.txt"
$array = (gc file.txt) -match "\w+" -replace "\w+="
for ($i=0;$i -lt $array.count;$i+=3) { if (($array[$i+1] -match "@") -and ($array[$i] -match "http://site1.ru")){$array[$i+1] + ";" + $array[$i+2]}}