正则表达式查找内容问题 [英] regex find content question

问题描述

尝试使用regex refind标记在此示例中使用coldfusion查找括号内的内容

Trying to use regex refind tag to find the content within the brackets in this example using coldfusion

 joe smith <[e-mail]>

生成的文本应为

 [e-mail]

使用此

<cfset reg = refind(
 "/(?<=\<).*?(?=\>)/s","Joe <[e-mail]>") />

没有运气。任何建议？

也许是一个语法问题，它在我使用的在线正则表达式测试工具。

Maybe a syntax issue, it works in an online regex tester I use.

推荐答案

您不能在CF的正则表达式引擎中使用lookbehind（使用 Apache Jakarta ORO < a>）。

You can't use lookbehind with CF's regex engine (uses Apache Jakarta ORO).

但是，您可以使用 Java的正则表达式，但它支持他们，我创建了一个包装CFC，使这更容易。可用范围：
http://www.hybridchill.com/projects/jre -utils.html

However, you can use Java's regex though, which does support them, and I've created a wrapper CFC that makes this even easier. Available from: http://www.hybridchill.com/projects/jre-utils.html

（更新：上述包装程序CFC已演变为完整项目，请参阅 cfregex.net 。）

(Update: The wrapper CFC mentioned above has evolved into a full project. See cfregex.net for details.)

，/.../s这里不需要/相关的东西。

Also, the /.../s stuff isn't required/relevant here.

所以，从你的例子，但改进regex：

So, from your example, but with improved regex:

<cfset jrex = createObject('component','jre-utils').init()/>

<cfset reg = jrex.match( "(?<=<)[^<>]+(?=>)" , "Joe <[e-mail]>" ) />

快速注意，因为我更新了正则表达式次;希望它现在是最好的...

A quick note, since I've updated that regex a few times; hopefully it's at its best now...

(?<=<) # positive lookbehind - start matching at `<` but don't capture it.
[^<>]+ # any char except  `<` or `>`, the `+` meaning one-or-more greedy.
(?=>)  # positive lookahead - only succeed if there's a `>` but don't capture it.

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