Adding numbers into 2 totals and put into each its own variable - powershell

Question

Hope you can help me with this little puzzle.
I have ONE txt file looking like this:
firstnumbers
348.92
237
230
329.31
secondnumbers
18.21
48.92
37
30
29.31
So a txt file with one Column that has 2 strings and some numbers on each line.
I want to take the total of each column and put it into each variable like say $a and $b
Yes it is 1 column, just to make sure no misunderstanding
It's pretty easy, if I use 2 files with each column of numbers without the headers(strings)
$a = (Get-Content 'firstnumbers.txt' | Measure-Object -Sum).Sum
$b = (Get-Content 'secondnumbers.txt' | Measure-Object -Sum).Sum
But it would be a little more cool to have them in one txt file, like the aforementioned with a header over each row of numbers.
I've tried removing the the headers with i.e. $a.Replace("first", $null).Replace("sec", $null) and then doing a $b.Split(" ")[1,2,3,4,5] ending with | measure -sum
That gives me the correct number of firstnumbers - but it won't work if I don't keep the specific set of numbers each time. They'll change and there's gonna be more or less of them.
It should be pretty easy I'm guessing. I just can't to seem wrap my head around it at the moment.
Any advice would be awesome!
cheers

Answer 1

Something like this should work:
$file = "C:\path\to\your.txt"
[IO.File]::ReadAllText($file) | % {
$_ -replace "`n+([0-9])", ' $1' -split "`n"
} | ? { $_ -ne "" } | % {
$a = $_ -split " ", 2
$v = $a[1] -split " " | Measure-Object -Sum
"{0}`t{1}" -f ($a[0], $v.Sum)
}
Output:
firstnumbers 1145,23
secondnumbers 163,44

Answer 2

Here's another approach, rather than parsing the text as one big blob, you could test each line to see if it contains a # or text, if it's text, then it triggers the creation of a new entry in a hashtable where the sums are stored:
# C:\Temp> get-content .\numbers.txt | foreach{
$val=0;
if([Decimal]::TryParse($_,[ref]$val)){
$sums[$key]+=$val
}else{
$sums += #{"$_"=0}; #add new entry to hashtable
$key=$_;}
} -end {$sums}
Name Value
---- -----
secondnumbers 163.44
firstnumbers 1145.23
Edit: As noted in the comments, the $sums variable persists for each run which causes problems if you run this command twice. You could call Remove-variable sums after each run, or add it to the end processing block like this:
# C:\Temp> get-content .\numbers.txt | foreach{
$val=0;
if([Decimal]::TryParse($_,[ref]$val)){
$sums[$key]+=$val
}else{
$sums += #{"$_"=0}; #add new entry to hashtable
$key=$_;}
} -end {$sums; remove-variable sums;}