Virtual Instances host name validation is inconsistent when editing

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, 7.2.X
• Fix Version/s: 7.1.10 DXP FP15, 7.1.X, 7.2.10 DXP FP1, 7.2.X, 7.2.1 CE GA2, Master
• Component/s: Portal Configuration > Portal Instances
• Labels:
  • STAB_TST_JA_DXP72
  • STAB_TST_JA_MUST
  • UandSM-aug19
  • ee-ts
  • liferay-fixpack-dxp-1-7210
  • liferay-fixpack-dxp-15-7110
• Branch Version/s:
  7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Sprint: U&SM | S03 Sprint 2, U&SM | S03 Sprint 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/75959

Summary:
The "Virtual Host" and "Mail Domain" fields have a validation check during the initial creation. If we create a proper virtual instance with valid "Virtual Host" and "Domain Names", anything can be inputted into those fields after editing.

The validator will permit the formula of (1) alphanumeric unaccented characters [0-9a-zA-Z], hyphen, and underscore + (2) at least two alphabet characters for the top-level domain (TLD).

Valid	Invalid
liferay.com	liferay.c
hello.co	hello
liferay.co.jp	ライフレイ.jp

Steps to Reproduce:
1. Add a Virtual Instance with valid Virtual Host and Mail Domain > Save

Virtual Host: lifer.ay
Mail Host: life.ray

2. Edit the same Virtual Instance's Virtual host and Mail Domain with things that would otherwise fail the initial validation

Virtual Host: lifera.y
Mail Host: サイト

3. Change entries to "test" > Save

Expected Results:
Validation kicks in, so we're unable to save changes and a fail message

Actual Results:
We're able to save invalid hostnames with a success message

Environment:
Tomcat 9.0.17 + MySQL 5.7 + Portal 7.2.x GIT ID:
0c346b627514af36785fd8f06befb86f10a584a8
Base Branch Commit: c8164d415304a63bfe7e8370a726fd44596c625e