Regex 翻譯機：用白話描述 → 給你正則 + 逐段解釋

I need a regular expression that matches: {{description}}.
Flavor: {{flavor}} (e.g. JavaScript / Python / PCRE).
Give me:
1. The regex.
2. A breakdown of each part and what it does.
3. 3 strings it SHOULD match and 2 it should NOT.
If my description is ambiguous, state your assumption.

把方括號 [ ] 內的變數換成你的內容，丟進 ChatGPT / Claude。

I need a regular expression that matches: {{description}}.
Flavor: {{flavor}} (e.g. JavaScript / Python / PCRE).
Give me:
1. The regex.
2. A breakdown of each part and what it does.
3. 3 strings it SHOULD match and 2 it should NOT.
If my description is ambiguous, state your assumption.