如何为特定格式的不定长字母数字字符串生成正则表达式？

Hey there! Let's put together the right regex for your exact use case. Here's a breakdown of what works, plus some variations to cover edge cases:

Basic Regex (Matches Your Example Format) #

This will match strings that follow the XX-XX-XX... pattern, with no trailing hyphen, and any number of two-character segments (at least one segment, or more if needed):

^[A-Za-z0-9]{2}(-[A-Za-z0-9]{2})+$

What Each Part Does: #

• ^: Anchors the match to the start of the string (so we don't accidentally match partial strings)
• [A-Za-z0-9]{2}: Matches exactly 2 alphanumeric characters (uppercase/lowercase letters, digits)
• (-[A-Za-z0-9]{2})+: Matches one or more instances of a hyphen followed by 2 alphanumeric characters
• $: Anchors the match to the end of the string (prevents extra invalid characters at the end)

Allow Single Two-Character Segment (No Hyphens) #

If you want to also match a standalone pair like AB or 12 (along with longer hyphen-separated strings), switch the + to * (which means "zero or more"):

^[A-Za-z0-9]{2}(-[A-Za-z0-9]{2})*$

For Hexadecimal-Specific Strings (Like Your Example) #

Since your sample uses hex characters (0-9, A-F, a-f), you can narrow down the character class to only match valid hex digits:

^[0-9A-Fa-f]{2}(-[0-9A-Fa-f]{2})*$

If your regex engine supports case-insensitive matching, you can simplify it with the /i modifier:

^[0-9A-F]{2}(-[0-9A-F]{2})*$/i

Quick Test Cases #

• Matches: 00-13-50-FF-FE-11-D8-3A (your example), AB-CD, 12, FF-00-AA
• Doesn't Match: A-BC (single character before hyphen), AB-CD- (trailing hyphen), AB_12 (non-alphanumeric character)

内容的提问来源于stack exchange，提问作者vinayak temgire