Split a logfile - powershell

Question

I have a log file with this:
Wed Oct 17 05:39:27 2018 : Resource = 'test04' cstep= 'titi04' time =18.751s
Wed Oct 17 05:40:31 2018 : Resource = 'test05' cstep= 'titi05' time =58.407s
Wed Oct 17 05:41:31 2018 : Resource = 'test06' cstep= 'titi06' time =3.400s
Wed Oct 17 05:42:31 2018 : Resource = 'test07' cstep= 'titi07' time =4.402s
I want split and want only the values greater than 5:
18.751
58.407
My script is in PowerShell and collects all values, not just values greater than 5:
$list = Get-Content "C:\Users\Desktop\slow_trans\log_file.txt"
$results = foreach ($line in $list) {
$line.Split('=')[3].Trim().TrimEnd('s')
}
$results
Results are
18.751
58.407
3.400
4.402
I want only
3.400
4.402

Answer 1

Changing the requirements on the fly is normally a no go,
so you don't deserve it.
Also the wording Superior 5 reminds me at a previous question from another user account..
Nevertheless here a script with a single pipe and datetime conversion.
## Q:\Test\2018\11\06\SO_53170145.ps1
Get-Content .\logfile.txt |
Where-Object {$_ -match '^(.*?) : .*time =([0-9\.]+)s'}|
Select-Object #{n='DT';e={([datetime]::ParseExact($Matches[1],'ddd MMM dd HH:mm:ss yyyy',[cultureinfo]::InvariantCulture).ToString('yyyy-MM-dd HH:mm:ss'))}},
#{n='val';e={[double]$Matches[2]}} |
Where-Object val -le 5
Sample output (decimal comma due to my German locale)
DT val
-- ---
2018-10-17 05:41:31 3,4
2018-10-17 05:42:31 4,402

Answer 2

the following casts the selected string as double and then returns only those which are less than 5
$results = Foreach ($line in $list) {
$val = [double]$line.Split('=')[3].Trim().TrimEnd('s')
if($val -lt 5) {
$val
}
}

Answer 3

Select-String is one option:
(Select-String -Path "TargetLog.txt" -Pattern ".*(?<time>\d+\.\d+)s").Matches |
ForEach-Object {
if([double]$_.Groups['time'].Value -lt 5.0) {$_.Value}
}
This will output the entire matching line:
Wed Oct 17 05:41:31 2018 : Resource = 'test06' cstep= 'titi06' time =3.400s
Wed Oct 17 05:42:31 2018 : Resource = 'test07' cstep= 'titi07' time =4.402s
If you only want the number from each line, change the if block to this:
{$_.Groups['time'].Value}