How to extract number in line "Task (12345)" using regular expression and Powershell?

Question

How to extract number in line "Task (12345)" using 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 

Can someone help me find the correct regular expression?

Answer 1

Do you want to receive all events 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 2

Keep in mind that Select-String does this in a single layer:

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

Answer 3

If you want exactly 5 digits, you can use:

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

Otherwise, for an arbitrary number of digits, enter:

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