add helper function Get-NetboxSlug.ps1

Functions/Helpers/Get-NetboxSlug.ps1

@@ -0,0 +1,16 @@
+function Get-NetboxSlug {
+    param (
+        [Parameter(ValueFromPipeline)]
+        [string]$slug,
+
+        [uint16]$chars = 100
+    )
+
+    process {
+        return $slug -replace '[^\-.\w\s]', '' `
+                     -replace '[^a-zA-Z0-9-_ ]', '' `
+                     -replace '^[\s.]+|[\s.]+$', '' `
+                     -replace '[-.\s]+', '-' `
+                     | ForEach-Object { $_.ToLower().Substring(0, [Math]::Min($_.Length, $chars)) }
+    }
+}