正则表达式搜索和替换，其中替换是搜索词的mod [英] Regex search and replace where the replacement is a mod of the search term

问题描述

我很难找到解决方案，并且非常确定正则表达式会支持它。我只是想不起来正则表达式领域中这个概念的名称。

我需要搜索并替换特定模式的字符串，但是模式可以不同并且替换需要记住要替换的内容。

例如，说我有一个任意字符串：134kshflskj9809hkj

我想用括号
括起来，所以结果是：（134）kshflskj（9809）hkj

查找数字很简单足够，但是如何包围它们？

任何人都可以提供样品或为我指明正确的方向吗？

解决方案

以多种语言显示：

  // C＃：
字符串结果= Regex.Replace（input，@（\d +），（$ 1））; 
 // JavaScript：
 thestring.replace（/（\d +）/ g，‘（$ 1）’）; 
 // Perl：
 s /（\d +）/（$ 1）/ g; 
 // PHP：
 $ result = preg_replace（ /（\d +）/，‘（$ 1）’，$ input）; 
  

（\d +）的括号将其设为组，特别是第一个（并且仅在这种情况下）该组，可以是后引用在替换字符串中。在某些实现中，必须使用 g 标志，以使其在单个字符串中多次匹配。替换字符串相当相似，尽管某些语言将使用 \1 而不是 $ 1 ，而某些语言将两者都允许。 / p>

i'm having a hard time finding a solution to this and am pretty sure that regex supports it. i just can't recall the name of the concept in the world of regex.

i need to search and replace a string for a specific pattern but the patterns can be different and the replacement needs to "remember" what it's replacing.

For example, say i have an arbitrary string: 134kshflskj9809hkj

and i want to surround the numbers with parentheses, so the result would be: (134)kshflskj(9809)hkj

Finding numbers is simple enough, but how to surround them?

Can anyone provide a sample or point me in the right direction?

解决方案

In some various langauges:

// C#:
string result = Regex.Replace(input, @"(\d+)", "($1)");
// JavaScript:
thestring.replace(/(\d+)/g, '($1)');
// Perl:
s/(\d+)/($1)/g;
// PHP:
$result = preg_replace("/(\d+)/", '($1)', $input);

The parentheses around (\d+) make it a "group" specifically the first (and only in this case) group which can be backreferenced in the replacement string. The g flag is required in some implementations to make it match multiple times in a single string). The replacement string is fairly similar although some languages will use \1 instead of $1 and some will allow both.

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