c# - 如何匹配正则表达式模式并从中提取数据

Question

我可以在格式为 {key-value}Some text{/key} 的文本区域内有 0 个或多个子字符串，

例如这是我的{link-123}测试{/link}文本区域

我想遍历匹配此模式的任何项目，根据键和值执行和操作，然后用新字符串替换此子字符串(由基于键的操作检索的 anchor 链接) .

我如何在 C# 中实现这一点？

Answer 1

如果这些标签没有嵌套，那么你只需要遍历文件一次；如果可以嵌套，则需要对每一层嵌套进行一次迭代。

此答案假定大括号仅作为标记定界符出现(而​​不是，例如，在注释内部):

result = Regex.Replace(subject, 
    @"\{                # opening brace
    (?<key>\w+)         # Match the key (alnum), capture into the group 'key'
    -                   # dash
    (?<value>\w+)       # Match the value (alnum), capture it as above
    \}                  # closing brace
    (?<content>         # Match and capture into the group 'content':
     (?:                # Match...
      (?!\{/?\k<key>)   # (unless there's an opening or closing tag
      .                 # of the same name right here) any character
     )*                 # any number of times
    )                   # End of capturing group
    \{/\k<key>\}        # Match the closing tag.", 
    new MatchEvaluator(ComputeReplacement), RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);

public String ComputeReplacement(Match m) {
    // You can vary the replacement text for each match on-the-fly
    // m.Groups["key"].Value will contain the key
    // m.Groups["value"].Value will contain the value of the match
    // m.Groups["value"].Value will contain the content between the tags
    return ""; // change this to return the string you generated here
}