Simple PowerShell way to change a string across multiple files

This situation comes up only occasionally and I keep forgetting how to do it, so here it is so I can save myself the time next time:

1) Position myself in the directory where the files are located
2) Type in this quicky applet in PowerShell:

$filenames = ls *.exe.config
$match = "devserver2"
$replacement = "prodserver1"
$filenames | %{
>> $content = get-content $_
>> $content = $content -creplace $match, $replacement
>> $content | set-content $_
>> }

Note that I used the case-sensitive PowerShell replace verb. I wish this could be a one-liner but I haven't been able to figure out how to do that.