有没有一种优雅的方式来解析一个单词，并添加之前大写字母空间 [英] is there a elegant way to parse a word and add spaces before capital letters

问题描述

我需要分析一些数据，我想转换

i need to parse some data and i want to convert

AutomaticTrackingSystem

到

Automatic Tracking System

基本上是把一个空间的任何大写字母之前（当然除了第一个）

essentially putting a space before any capital letter (besides the first one of course)

推荐答案

您可以使用lookarounds，例如：

You can use lookarounds, e.g:

string[] tests = {
   "AutomaticTrackingSystem",
   "XMLEditor",
};

Regex r = new Regex(@"(?!^)(?=[A-Z])");
foreach (string test in tests) {
   Console.WriteLine(r.Replace(test, " "));
}

此照片（因为看到ideone.com ）：

Automatic Tracking System
X M L Editor

正则表达式（^！）由两个断言（= [AZ]？）：

The regex (?!^)(?=[A-Z]) consists of two assertions:

• （^！） - 也就是我们不是在字符串
的开始
• （= [AZ]） - 即我们只是一个大写字母之前

• (?!^) - i.e. we're not at the beginning of the string
• (?=[A-Z]) - i.e. we're just before an uppercase letter

• <一个href="http://stackoverflow.com/questions/2559759/how-do-i-convert-camelcase-into-human-readable-names-in-java/">How我做驼峰转换成Java的人类可读的名字？
• 如何经常EX pression （小于？=＃）[^＃] + 工作
（=＃？）？

• How do I convert CamelCase into human-readable names in Java?
• How does the regular expression (?<=#)[^#]+(?=#) work?

• <一个href="http://www.regular-ex$p$pssions.info/lookaround.html">regular-ex$p$pssions.info/Lookarounds

在此处，使用断言真正有所作为，当你有几个不同的规则，和/或要分割而不是替换。这个例子结合了：

Here's where using assertions really make a difference, when you have several different rules, and/or you want to Split instead of Replace. This example combines both:

string[] tests = {
   "AutomaticTrackingSystem",
   "XMLEditor",
   "AnXMLAndXSLT2.0Tool",
};

Regex r = new Regex(
   @"  (?<=[A-Z])(?=[A-Z][a-z])    # UC before me, UC lc after me
    |  (?<=[^A-Z])(?=[A-Z])        # Not UC before me, UC after me
    |  (?<=[A-Za-z])(?=[^A-Za-z])  # Letter before me, non letter after me
    ",
   RegexOptions.IgnorePatternWhitespace
);
foreach (string test in tests) {
   foreach (string part in r.Split(test)) {
      Console.Write("[" + part + "]");
   }
   Console.WriteLine();
}

此照片（因为看到ideone.com ）：

[Automatic][Tracking][System]
[XML][Editor]
[An][XML][And][XSLT][2.0][Tool]

相关问题

• 的Java分裂是吃了我的角色。
  • 在对零宽度匹配断言分裂的例子很多

  Related questions

  • Java split is eating my characters.
    • Has many examples of splitting on zero-width matching assertions

    这篇关于有没有一种优雅的方式来解析一个单词，并添加之前大写字母空间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！