diff --git a/get-new-tool-versions/get-new-tool-versions.Tests.ps1 b/get-new-tool-versions/get-new-tool-versions.Tests.ps1
index 5638fa4..3d5e9c1 100644
--- a/get-new-tool-versions/get-new-tool-versions.Tests.ps1
+++ b/get-new-tool-versions/get-new-tool-versions.Tests.ps1
@@ -2,6 +2,21 @@
 
 Import-Module (Join-Path $PSScriptRoot "helpers.psm1") -Force
   
+Describe "Validate-FiltersFormat" {
+    It "Filter with word" {
+        { Validate-FiltersFormat -Filters @("1two.2") } | Should -Throw "Invalid filter format"
+    }
+
+    It "Filter with non-word character" {
+        { Validate-FiltersFormat -Filters @("1,.2") } | Should -Throw "Invalid filter format"
+    }
+
+    It "Valid filters" {
+        { Validate-FiltersFormat -Filters @("*", "1", "1.*", "1.2", "1.2.*") } | Should -Not -Throw "Invalid filter format"
+    }
+
+}
+
 Describe "Format-Versions" {
     It "Clean versions" {
         $actualOutput = Format-Versions -Versions @("14.2.0", "1.14.0")
@@ -34,13 +49,13 @@ Describe "Format-Versions" {
     }
 }
 
-Describe "Filter-Versions" {
+Describe "Select-VersionsByFilter" {
     $inputVersions = @("8.2.1", "9.3.3", "10.0.2", "10.0.3", "10.5.6", "12.4.3", "12.5.1", "14.2.0")
 
     It "Include filter only" {
         $includeFilters = @("8.*", "14.*")
         $excludeFilters = @()
-        $actualOutput = Filter-Versions -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
+        $actualOutput = Select-VersionsByFilter -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
         $expectedOutput = @("8.2.1", "14.2.0")
         $actualOutput | Should -Be $expectedOutput
     }
@@ -48,7 +63,7 @@ Describe "Filter-Versions" {
     It "Include and exclude filters" {
         $includeFilters = @("10.*", "12.*")
         $excludeFilters = @("10.0.*", "12.4.3")
-        $actualOutput = Filter-Versions -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
+        $actualOutput = Select-VersionsByFilter -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
         $expectedOutput = @("10.5.6", "12.5.1")
         $actualOutput | Should -Be $expectedOutput
     }
@@ -56,13 +71,13 @@ Describe "Filter-Versions" {
     It "Exclude filter only" {
         $includeFilters = @()
         $excludeFilters = @("10.*", "12.*")
-        $actualOutput = Filter-Versions -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
+        $actualOutput = Select-VersionsByFilter -Versions $inputVersions -IncludeFilters $includeFilters -ExcludeFilters $excludeFilters
         $expectedOutput = @("8.2.1", "9.3.3", "14.2.0")
         $actualOutput | Should -Be $expectedOutput
     }
 
     It "Include and exclude filters are empty" {
-        $actualOutput = Filter-Versions -Versions $inputVersions
+        $actualOutput = Select-VersionsByFilter -Versions $inputVersions
         $expectedOutput = @("8.2.1", "9.3.3", "10.0.2", "10.0.3", "10.5.6", "12.4.3", "12.5.1", "14.2.0")
         $actualOutput | Should -Be $expectedOutput
     }
diff --git a/get-new-tool-versions/get-new-tool-versions.ps1 b/get-new-tool-versions/get-new-tool-versions.ps1
index 25fdd77..6d3a021 100644
--- a/get-new-tool-versions/get-new-tool-versions.ps1
+++ b/get-new-tool-versions/get-new-tool-versions.ps1
@@ -14,10 +14,6 @@ param (
 
 Import-Module (Join-Path $PSScriptRoot "helpers.psm1")
 
-$VersionFilterToInclude.GetType()
-$VersionFilterToInclude.Length
-$VersionFilterToInclude | ForEach-Object { Write-Host $_ }
-
 function Get-VersionsByUrl {
     param (
         [Parameter(Mandatory)] [string] $ToolPackagesUrl,
@@ -29,6 +25,14 @@ function Get-VersionsByUrl {
     return $packages.version
 }
 
+if ($VersionFilterToInclude) {
+    Validate-FiltersFormat -Filters $VersionFilterToInclude
+}
+
+if ($VersionFilterToExclude) {
+    Validate-FiltersFormat -Filters $VersionFilterToExclude
+}
+
 Write-Host "Get the packages list from $DistURL"
 $versionsFromDist = Get-VersionsByUrl -ToolPackagesUrl $DistURL `
                                       -RetryIntervalSec $RetryIntervalSec `
@@ -41,9 +45,9 @@ Write-Host "Get the packages list from $ManifestLink"
 
 [Version[]] $formattedVersions = Format-Versions -Versions $versionsFromDist
 
-$formattedVersions = Filter-Versions -Versions $formattedVersions `
-                                     -IncludeFilters $VersionFilterToInclude `
-                                     -ExcludeFilters $VersionFilterToExclude
+$formattedVersions = Select-VersionsByFilter -Versions $formattedVersions `
+                                             -IncludeFilters $VersionFilterToInclude `
+                                             -ExcludeFilters $VersionFilterToExclude
 
 $versionsToBuild = Skip-ExistingVersions -VersionsFromManifest $versionsFromManifest `
                                          -VersionsFromDist $formattedVersions
diff --git a/get-new-tool-versions/helpers.psm1 b/get-new-tool-versions/helpers.psm1
index 2cdc330..7b5af82 100644
--- a/get-new-tool-versions/helpers.psm1
+++ b/get-new-tool-versions/helpers.psm1
@@ -1,3 +1,17 @@
+function Validate-FiltersFormat {
+    param (
+        [Parameter(Mandatory)] [string[]] $Filters
+    )
+
+    foreach($filter in $Filters) {
+        $filter.Split('.') | ForEach-Object {
+            if (($_ -notmatch '^\d+$') -and ($_ -ne '*')) {
+                throw "Invalid filter format - $filter"
+            }
+        }
+    }
+}
+
 function Format-Versions {
     param (
         [Parameter(Mandatory)] [string[]] $Versions
@@ -30,7 +44,7 @@ function Format-Versions {
     return $formattedVersions
 }
 
-function Filter-Versions {
+function Select-VersionsByFilter {
     param (
         [Parameter(Mandatory)] [version[]] $Versions,
         [string[]] $IncludeFilters,
@@ -45,8 +59,7 @@ function Filter-Versions {
         $ver = $_
         $matchedIncludeFilters = $IncludeFilters | Where-Object { $ver -like $_ }
         $matchedExcludeFilters = $ExcludeFilters | Where-Object { $ver -like $_ }
-
-        return ($matchedIncludeFilters -ne $null) -and ($matchedExcludeFilters -eq $null)
+        return ($null -ne $matchedIncludeFilters) -and ($null -eq $matchedExcludeFilters)
     }
 }