简体繁体 English

Java正则表达式负提前

[英]Java Regex Negative Lookahead

原文 2012-12-20 07:52:13 4 1 java/ regex

After looking through the answers that are already on StackOverflow regarding this issue, I settled with the most accurate one I could find: 浏览完关于此问题的StackOverflow上的答案后，我找到了最准确的答案：

Java regex: Negative lookahead Java正则表达式：负向提前

I went over to gskinner and tested it. 我去了gskinner并进行了测试。 I put /foo/(?!.*\\\\bbar\\\\b).+ in the pattern input box and the following in the regex match text area: 我将/foo/(?!.*\\\\bbar\\\\b).+放在模式输入框中，并将以下内容放在正则表达式匹配文本区域中：

/foo/abc123doremi / foo / abc123doremi

/foo/abc123doremi/bar/def456fasola / foo / abc123doremi / bar / def456fasola

Gskinner recognised both of these as matches though so clearly either Gskinner is wrong or the regex pattern above isn't correct. Gskinner认为这两个都是匹配项，尽管很明显Gskinner错误或上述正则表达式模式不正确。 Any thoughts? 有什么想法吗？

1 个解决方案

You are looking for \\bbar\\b while your text contains /bar/ . 您的文字包含/bar/您正在寻找\\bbar\\b 。

What you meant is probably \\bbar\\b (ie /foo/(?!.*\\bbar\\b).+ ) 您的意思可能是\\bbar\\b （即/foo/(?!.*\\bbar\\b).+ ）

Note that "duplicate the \\ " is only required inside of Java String literals. 注意，仅在Java String文字内部需要“复制\\ ”。 That makes writing regexs in Java a bit of a pain. 这使得用Java编写正则表达式有点麻烦。