get-childitem -filter *.log -recurse |
select-string -pattern "\s40[0-9]\s" |
format-table Filename,LineNumber,Line -wrap

get-childitem -filter *.log -recurse |
select-string -pattern "\s40[^4][0-9]?\s" |
format-table Filename,LineNumber,Line -wrap

get-childitem -filter *.log -recurse |
Select-string -pattern "10\.0;[\w\W]+\+Gecko"

1:
Get-ChildItem c:\windows | where {$_.name -match "\d{2}"}
Get-ChildItem c:\windows | where {$_.name -match "[0-9]{2}"}

Get-Module | where {$_.companyname -match "Microsoft"}

get-content WindowsUpdate.log |
Select-string "[\w+\W+]Installing Update"

Get-content WindowsUpdate.log| select-string "[\w+\W+]Installing"|
format-table LineNumber,Line -wrap