使用正则表达式限制响应中的单词数 [英] Limit the number of words in a response with a regular expression

问题描述

有没有人有一个正则表达式可以限制响应中的单词数?例如，我想将它与 jQuery 验证一起使用，这样我就可以将文本框/文本区域限制为 250 个单词.这些框将是纯文本的.

我已经进行了一些谷歌搜索，但我发现的都不是很好.他们主要集中在做 \b\w+\b 但我很难让它工作.

解决方案

你可以试试:

^(?:\b\w+\b[\s\r\n]*){1,250}$

这将限制为多行 250 个单词.

恐怕是艾伦最初的提议:

/^\w+(?:\s+\w+){0,249}$/

可能是灾难性回溯<块引用>

嵌套重复操作符时，请确保只有一种方法可以匹配相同的匹配项

Does anybody have a regular expression that would work to limit the number of words in a response? For instance, I'd like to use it with jQuery validate so I can restrict a textbox/textarea to have say 250 words. The boxes will be plain-text.

I've done some Googling but none of the ones I've found were very good. They mostly centered around doing \b\w+\b but I had trouble getting it work.

解决方案

Could you try:

^(?:\b\w+\b[\s\r\n]*){1,250}$

That would limit to 250 words over multiple lines.

I am afraid that the Alan's initial proposition:

/^\w+(?:\s+\w+){0,249}$/

might be a case of catastrophic backtracking

When nesting repetition operators, make absolutely sure that there is only one way to match the same match

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