Question

假设我有几行维基百科XML，如下所示：

[[图片来源：ChicagoAnarchists.jpg | thumb |一个有同情心的雕刻 [[沃尔特克兰]]后执行的“芝加哥无政府主义者” [[Haymarket事务]]。 Haymarket事件通常被认为是国际[[五一]]起源最重要的事件 [纪念] 1907年，[国际无政府主义者大会] 阿姆斯特丹]]聚集了来自14个不同国家的代表无政府主义运动的哪些重要人物，包括[[Errico 马拉泰斯塔]

我想删除以[[Image:" and closed by "observances]]开头的行。可能还有其他几行文本也有括号，我不想做贪婪的搜索，否则也可能意外删除其他括号。

例如，如果我只是做了一个贪婪的\\[\\[Image:.*\\]\\]，我相信它会删除最后一个右括号（Ericco Malatesta）的所有内容

是否有正则表达式可以让我更容易？

Answer 1

让我们看看...使用懒惰重复而不是贪婪怎么样？

\[\[Image:.*?observances\]\]

Answer 2

这个例子怎么了？

s.replaceAll("(\\[{2}Image:(?:(?:\\[{2}).*\\]{2}|[^\\[])*\\]{2})", "");

仅替换此文字：

[[Image:ChicagoAnarchists.jpg|thumb|A sympathetic engraving by [[Walter Crane]] of the executed "Anarchists of Chicago" after the [[Haymarket affair]]. The Haymarket affair is generally considered the most significant event for the origin of international [[May Day]] observances]]

Answer 3

这有效：

str.replaceAll("^\\[\\[([^\\[]*?(\\[\\[[^\\]]*\\]\\])?[^\\[]*?)*?\\]\\]\\s*", "");

输入输出：

In 1907, the [[International...

这是有效的，因为它正在寻找匹配的[[和]]（以及周围的文字）里面的第一对。

Answer 4

也许是这样的：

(.*?\\[\\[[^\\[]*?\\]\\][^\\[]*\\]\\])

我试过

public class My {

public static void main(String[] args) {
    String foo = "[[Image:ChicagoAnarchists.jpg|thumb|A sympathetic engraving by [[Walter Crane]] of the executed \"Anarchists of Chicago\" after the [[Haymarket affair]]. The Haymarket affair is generally considered the most significant event for the origin of international [[May Day]] observances]] In 1907, the [[International Anarchist Congress of Amsterdam]] gathered delegates from 14 different countries, among which important figures of the anarchist movement, including [[Errico Malatesta]]";
    Matcher m = Pattern.compile("(.*?\\[\\[[^\\[]*?\\]\\][^\\[]*\\]\\])").matcher(foo);
    while (m.find()) {
        System.out.print(m.group(1));
    }
}}

打印

[[Image:ChicagoAnarchists.jpg|thumb|A sympathetic engraving by [[Walter Crane]] of the executed "Anarchists of Chicago" after the [[Haymarket affair]]. The Haymarket affair is generally considered the most significant event for the origin of international [[May Day]] observances]]

希望这会有所帮助：D

Answer 5

使用以下测试字符串（注意，我在其中添加了一个[[image:foobar[[foo [baz] bar]]foobar]]）：

[[Image:ChicagoAnarchists.jpg|thumb|A sympathetic engraving by [[Walter Crane]] of the executed \"Anarchists of Chicago\" after the [[Haymarket affair]]. The Haymarket affair is generally considered the most significant event for the origin of international [[May Day]] observances]] In 1907, the [[International Anarchist Congress of[[image:foobar[[foo [baz] bar]]foobar]] Amsterdam]] gathered delegates from 14 different countries, among which important figures of the anarchist movement, including [[Errico Malatesta]]

正则表达式：

(?i)\\[\\[image:(?:\\[\\[(?:(?!(?:\\[\\[|]])).)*]]|(?:(?!(?:\\[\\[|]])).)*?)*?]]

testString.replaceAll(<above pattern>, "")将返回：

 In 1907, the [[International Anarchist Congress of Amsterdam]] gathered delegates from 14 different countries, among which important figures of the anarchist movement, including [[Errico Malatesta]]

以下是正则表达式的更详细说明：

(?i)                    # Case insensitive flag
\[\[image:              # Match literal characters '[[image:'
(?:                     # Begin non-capturing group
  \[\[                  # Match literal characters '[['
  (?:                   # Begin non-capturing group
    (?!                 # Begin non-capturing negative look-ahead group
      (?:               # Begin non-capturing group
        \[\[            # Match literal characters '[['
        |               # Match previous atom or next atom
        ]]              # Match literal characters ']]'
      )                 # End non-capturing group
    )                   # End non-capturing negative look-ahead group
    .                   # Match any character
  )                     # End non-capturing group
  *                     # Match previous atom zero or more times
  ]]                    # Match literal characters ']]'
  |                     # Match previous atom or next atom
  (?:                   # Begin non-capturing group
    (?!                 # Begin non-capturing negative look-ahead group
      (?:               # Begin non-capturing group
        \[\[            # Match literal characters '[['
        |               # Match previous atom or next atom
        ]]              # Match literal characters ']]'
      )                 # End non-capturing group
    )                   # End non-capturing negative look-ahead group
    .                   # Match any character
  )                     # End non-capturing group
  *?                    # Reluctantly match previous atom zero or more times
)                       # End non-capturing group
*?                      # Reluctantly match previous atom zero or more times
]]                      # Match literal characters ']]'

这只会处理一级嵌套[[...]]模式。正如this answer至this question TJR所述，正则表达式不会处理无限制的嵌套原子。因此，此正则表达式模式与[[foo[[baz]]bar]]字符串中的[[image:...]]不匹配。

要获得精彩的正则表达式参考，请参阅Regular-Expressions.info。

java中的正则表达式可以捕获并删除此模式？

5 个答案: