How to extract the number in the string "Task(12345)" with Regular Expression and Powershell?

Question

How to extract the number in the string "Task(12345)" with Regular Expression and Powershell? I tried the following, but no chance.

$file = gc myfile.txt
$matches = ([regex]"Task\(\d{1,5}\)").matches($file)
# Get a list of numbers

Could someone please help me to find the correct regular expression?

Thanks, Martin

Answer 1

If you want exactly 5 digits in there you could use:

^Task\([\d{1,5}]{5}\)$

Otherwise for an arbitrary number of digits go with:

^Task\([\d{1,5}]+\)$

Answer 2

Do you want to get all occurances in the file? If so I would do the following

$r = "^Task\((\d+)\)$"
$res = gc myFile.txt | 
  ?{ $_ -match $r } |
  %{ $_ -match $r | out-null ; $matches[1] }

Answer 3

Keep in mind that Select-String makes this a one-liner:

PS> Select-String 'Task\((?<num>\d{1,5})\)' myfile.txt | 
        %{$_.matches[0].Groups['num'].value}