fix(plex): accept - and capital letters in ADVERTISE_IP (#3448)

charts/stable/plex/docs/validation.md

@@ -7,6 +7,7 @@ Accepts:
 - Empty string
 - `http://` or `https://`
 - IP or DNS host
+- Characters (`0-9`, `a-z`, `A-Z`, `-`, `.`)
 - Port is optional
 - `,` Separated
 
@@ -17,10 +18,13 @@ Accepted formats are:
 - `http://dnshost:32400`
 - `https://dnshost:32400`
 - `https://dnshost`
+- `https://DNSHOST`
+- `https://DNS-HOST`
+- `https://dns-host`
 - `https://dnshost,http://192.168.1.100:32400`
 
-Regex used to match this: `^$|^(http(s)?:\/\/([a-z0-9.]*)(:\d{0,5})?,?)*$`
-You can try live [here](https://regex101.com/r/iC2WYp/1)
+Regex used to match this: `^$|^(http(s)?:\/\/([a-zA-Z0-9.-]*)(:\d{0,5})?,?)*$`
+You can try live [here](https://regex101.com/r/zay2xO/1)
 
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