The .Remove method in PowerShell doesn’t work the way you’re attempting to use it, as it expects a single string, and you’re trying to use it on an array.

To filter out the specific tags and names and discard the numbers at the beginning of the strings, you can use a combination of -replace to remove the numbers and Select-String or Where-Object to filter specific names.

use this script

# The list of image tags from the previous command
$imageTags = @(
    "testcontainersgw.azurecr.io/reloader:v1.0.51",
    "testcontainersgw.azurecr.io/tef/ip-id:19900909.1",
    "testcontainersgw.azurecr.io/tef/ip-license:19900909.1",
    "testcontainersgw.azurecr.io/tef/ip-finalsync:19900906.2",
    "testcontainersgw.azurecr.io/tef/ip-tubelas:19900909.1",
    "mcr.microsoft.com/aks/ip-masq-agent-v2:v0.1.11",
    "mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.30.3"
)

# Filter the image tags with "ip-" in the name and extract the tags
$filteredTags = $imageTags | Where-Object {
    # Filter lines containing "ip-"
    $_ -like "*ip-*"
} | ForEach-Object {
    # Extract the image name and version
    $nameVersion = $_ -split '[:/]'
    # Output the image name and version
    $nameVersion[2], $nameVersion[3]
}

# Output the filtered tags
$filteredTags

Example-

Deploy your images

Check the pods

Run the script I shared above

update for your follow up question-

To format the output of your PowerShell script so that the image name and version appear on the same line use the below script-

edited script-

# The list of image tags from the previous command
$imageTags = @(
    "testcontainersgw.azurecr.io/reloader:v1.0.51",
    "testcontainersgw.azurecr.io/tef/ip-id:19900909.1",
    "testcontainersgw.azurecr.io/tef/ip-license:19900909.1",
    "testcontainersgw.azurecr.io/tef/ip-finalsync:19900906.2",
    "testcontainersgw.azurecr.io/tef/ip-tubelas:19900909.1",
    "mcr.microsoft.com/aks/ip-masq-agent-v2:v0.1.11",
    "mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.30.3"
)

# Filter the image tags with "ip-" in the name and extract the tags
$filteredTags = $imageTags | Where-Object {
    # Filter lines containing "ip-"
    $_ -like "*ip-*"
} | ForEach-Object {
    # Extract the image name and version
    $nameVersion = $_ -split '[:/]'
    # Output the image name and version in one line
    "$($nameVersion[2]) $($nameVersion[3])"
}

# Output the formatted tags
$filteredTags

output using the previous script vs output using this edited one.