$content = [System.IO.File]::ReadAllText("index.html", [System.Text.Encoding]::UTF8)

$content = $content -replace '<option>1 BHK . 658 Sq\.ft</option>', '<option>2 BHK - 955 to 1,100 Sq.ft</option>'
$content = $content -replace '<option>2 BHK . 997 to 1180 Sq\.ft</option>', '<option>2.5 BHK - 1,100 Sq.ft</option>'
$content = $content -replace '<option>3 BHK . 1270 to 1498 Sq\.ft</option>', '<option>3 BHK - 1,180 to 1,490 Sq.ft</option>'

[System.IO.File]::WriteAllText("index.html", $content, [System.Text.Encoding]::UTF8)
