ASP.NET DataAnnotations正则：如何匹配1-53周数的年周格式？

Got it, let's get that regex sorted to meet all your validation needs. Your original pattern works for most cases but misses two key requirements: supporting 1-digit week numbers (like 2010-1) and blocking invalid week values (00, 54+, etc.).

First, Let's Define the Exact Rules We Need to Match #

• Year: Exactly 4 digits (your examples include 6502 so we don't need to restrict the year range)
• Separator: A single hyphen -
• Week Number: Must be between 1-53, supporting:
  • 1-digit format: 1 to 9
  • 2-digit format: 01 to 09 (with leading zero) and 10 to 53
• Invalid Cases to Block: 00, 54 to 99

The Corrected Regular Expression #

Here's the regex that covers all these rules:

^\d{4}-(?:0?[1-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-3])$

Breaking Down the Pattern #

Let's walk through each part to make it clear:

• ^ : Start-of-string anchor (ensures we don't match partial values like abc2024-12)
• \d{4} : Matches exactly 4 digits for the year
• - : Literal hyphen separator
• (?:...) : Non-capturing group (groups our week number options without creating unnecessary capture groups)
  • 0?[1-9] : Matches 1-9, with an optional leading zero (so 1, 01, 9, 09 all work)
  • | : OR operator, separating valid week number ranges
  • 1[0-9] : Matches 10-19
  • 2[0-9] : Matches 20-29
  • 3[0-9] : Matches 30-39
  • 4[0-9] : Matches 40-49
  • 5[0-3] : Matches 50-53 (blocks 54 and above)
• $ : End-of-string anchor (ensures no extra characters after the week number, like 2024-12x)

Implementing in ASP.NET ViewModel #

Drop this into your RegularExpression attribute, with a clear error message:

[RegularExpression(@"^\d{4}-(?:0?[1-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-3])$",
    ErrorMessage = "Work Week must follow the format XXXX-WW where XXXX is a 4-digit year, and WW is a week number between 1-53 (supports 1-digit like 2010-1 or 2-digit like 2019-09)")]
public string WorkWeek { get; set; }

Validating Your Test Cases #

Let's confirm this works with your examples:

• Valid matches: 2001-01, 2001-10, 2010-1, 6502-9 → all are accepted
• Invalid matches: 2056-54, 2068-60, 5416-00 → all are rejected (as expected)

Why Your Original Regex Failed #

Your original pattern [\d]{4}-[0-5]\d had two key issues:

1. It required the week number to be exactly two digits, so 1-digit values like 2010-1 were rejected
2. It allowed invalid week numbers: 00 (since [0-5]\d matches 00) and 54-59 (since [0-5] allows 5 as the first digit, followed by any digit)

内容的提问来源于stack exchange，提问作者Luke Hammer