正則表達式邏輯分析工具: https://regexper.com
/^\s*$/
/^1((3\d)|(4[579])|(5([0-3]|[5-9]))|66|7(3|[5-8])|(8\d)|(9[89]))\d{8}$/
/^[a-zA-Z0-9\-_]{6,20}$/
/^(?=.*\d)(?=.*[a-zA-Z])[0-9a-zA-Z]{6,20}$/