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

Question 1

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

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$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?

Question 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] }

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$r = "^Task$(\d+)$$"

$res = gc myFile.txt |

?{ $_ -match $r } |

%{ $_ -match $r | out-null ; $matches[1] }

Question: