C# Regex 原子左括号和右括号

Question

我有以下占位符，我正在尝试使用原子组成对捕获双开括号和闭括号：

{{(?>{{(?)|}}(<-DEPTH>)|[^{}])*}}(?(DEPTH)(?!))

I am {{name}} and I have {{scales}: red {{metallic_scales}: shiny and glistering}} scales}}

可以肯定地说，我并没有真正取得多大成功。

所以我想要这样的东西：

{{姓名}}
{{鳞片}：红色{{metallic_scales}：闪闪发亮}}鳞片}}
{{metallic_scales}：闪闪发亮}}

Answer 1

您可以使用

(?=                    # Start of a positive lookahead to enable overlapping matches
  (?<results>          # The group storing the results
    {{                 # {{ (left-hand delimiter)
      (?>              # Start of an atomic group
        (?!{{|}}).|    # Any char not starting {{ or }} char sequence, or
        {{(?<DEPTH>)|  # {{ and a value pushed on to DEPTH group stack, or
        }}(?<-DEPTH>)  # }} and a value popped from the DEPTH group stack
      )*               # Zero or more repetitions of the atomic group patterns
    }}                 # }} substring
    (?(DEPTH)(?!))     # Conditional construct failing the match if DEPTH stack is not empty
  )                    # End of the results group
)                      # End of the lookahead

参见regex demo。

C# 声明：

Regex reg = new Regex(@"
    (?=                  # Start of a positive lookahead to enable overlapping matches
      (?<results>          # The group storing the results
        {{                 # {{ (left-hand delimiter)
          (?>              # Start of an atomic group
            (?!{{|}}).|    # Any char not starting {{ or }} char sequence, or
            {{(?<DEPTH>)|  # {{ and a value pushed on to DEPTH group stack, or
            }}(?<-DEPTH>)  # }} and a value popped from the DEPTH group stack
          )*               # Zero or more repetitions of the atomic group patterns
        }}                 # }} substring
        (?(DEPTH)(?!))     # Conditional construct failing the match if DEPTH stack is not empty
      )                    # End of the results group
    )                      # End of the lookahead", 
    RegexOptions.IgnorePatternWhitespace | RegexOptions.Singleline);
var results = reg.Matches(text).Cast<Match>().Select(x => x.Groups["results"].Value);

C# Regex 原子左括号和右括号

C# Regex Atomic Opening and Closing Brackets

c#

regex

regex-group