c# - 有没有一种优雅的方法来解析单词并在大写字母前添加空格

Question

我需要解析一些数据，我想转换

AutomaticTrackingSystem

到

Automatic Tracking System

本质上是在任何大写字母前放置一个空格(当然除了第一个)

Answer 1

您可以使用环视，例如:

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

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

这会打印 ( as seen on ideone.com ):

Automatic Tracking System
X M L Editor

正则表达式 (?!^)(?=[A-Z])由两个断言组成:

• (?!^) - 即我们不在字符串的开头
• (?=[A-Z]) - 即我们就在大写字母之前

相关问题

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

引用资料

• regular-expressions.info/Lookarounds

---

平分秋色

这就是使用断言真正发挥作用的地方，当您有多个不同的规则，和/或您想要 Split而不是 Replace .这个例子结合了两者:

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();
}

这会打印 ( as seen on ideone.com ):

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

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• Java split is eating my characters.
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