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Closed 11 years ago.

我需要匹配一个字母数字的单词。它可以包含“ - ”, 但不包含在结尾或开头, 并且“ - ” 不能重复( 如“ - ” ), 单词长度必须在 2 到 24 个字符之间。

一些例子:

adfg
asd-asdasd
asd-asd-asd

这些都不应相匹配:

-asd
asd-
-asd-
-asd--asd-

Answer 1

使用regexes最困难的一件事是抵制过度聪明的诱惑。你有两个不同的、不相容的测试要进行。长度 :

/^.{2,24}$/

...和组成:

/^[A-Z0-9]+(?:-[A-Z0-9]+)*$/i

虽然 might 有可能提出一个正方形, 在一个关口进行两次测试, 但没有必要。只要先看一个即可 :

/^(?=.{2,24}$)[A-Z0-9]+(?:-[A-Z0-9]+)*$/i

Answer 2

尝试此 PCRE Reg 演示文稿 :

/^(([0-9a-z]+-)*[0-9a-z]){2,24}$/i

Answer 3

Regular expressions depend on the platform you are using, and they are not very good for matching sizes (if you try to determine a specific length, you will probably loose flexibility, unless you are checking more standardized inputs, like dates: d{2}/d{2}/d{4}). But something like:

[a-z]+(-[a-z]+)*

可能给你一个想法为你的问题。

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