你可以用

^[0-9]+[A-Z]?(-[0-9])?$

参见regex demo。

• 详情 *：
• ^-字符串开始
• [0-9]+-一个或多个数字
• [A-Z]?-可选大写ASCII字母
• (-[0-9])?--和数字的可选序列
• $-字符串结束。

两种选择：“非常长”和“非常短”的版本。两者都假定RUC（无校验位）的长度为6到8个字符。
1.最后一个“非常长”的版本：
在这里，可以出现在文档末尾的唯一字母数字字符是大写 A。

^(?:(?!0)\d{6,8}|(?!0)\d{5,7}A)(?:-\d)?$

^           # Start of string
  (?:         # Start of first non-capturing group:
    (?!0)       # Negative lookahead (?!): avoid starting with zero
    \d{6,8}     # Digits (an equivalent is [0-9]); 6 to 8 times
      |           # Or
    (?!0)       # Negative lookahead (?!): avoid starting with zero
    \d{5,7}A    # Digits (an equivalent is [0-9]); 5 to 7 times, followed by an 'A'
  )           # End of first non-capturing group
  (?:         # Start of second non-capturing group:
    -\d         # A hyphen followed by a single digit
  )?          # End of second non-capturing group; '?' = 'optional': may or may not appear
$           # End of string

具有捕获组的版本：

^((?!0)\d{6,8}|(?!0)\d{5,7}A)(-\d)?$

1.最短的版本：
在这种情况下，只有大写 A 或 B 或 C 或 D 可以是可以出现在文档结尾的字母数字字符。

^[1-9]\d{4,6}[\dA-D](?:-\d)?$

# or

^[1-9]\d{4,6}[\dA-D](-\d)?$

^           # Start of string
  [1-9]       # Digits from 1 to 9 (avoid starting with zero)
  \d{4,6}     # Digits (an equivalent is [0-9]); 4 to 6 times
  [\dA-D]     # Digits or capital A/B/C/D
  (?:         # Start of non-capturing group:
    -\d         # A hyphen followed by a single digit
  )?          # End of second non-capturing group; '?' = 'optional': may or may not appear
$           # End of string

均在JavaScript中测试。

• What is a non-capturing group in regular expressions?
• What does ?! mean?
• 事实：字母“A”被添加到错误重复的文件编号中。