c# – 正则表达式只能得到包含数字的方括号,但不在方括号内

示例字符串

"[] [ds*[000112]] [1448472995] sample string [1448472995] ***";

正则表达式应该匹配

[1448472995] [1448472995]

因为有外方括号,所以不应该匹配[000112].

目前我的这个正则表达式也匹配[000112]

const string unixTimeStampPattern = @"\[([0-9]+)]";

解决方法

这是使用平衡文本执行此操作的好方法.

( \[ \d+ \] )                 # (1)
 |                             # or,\[                            # opening bracket
    (?>                           # Then either match (possessively):
         [^\[\]]+                      #  non - brackets
      |                              # or
         \[                            #  [ increase the bracket counter
         (?<Depth> )
      |                              # or
         \]                            #  ] decrease the bracket counter
         (?<-Depth> )
    )*                            # Repeat as needed.
    (?(Depth)                     # Assert that the bracket counter is at zero
         (?!)
    )
    \]                            # Closing bracket

C#样本

string sTestSample = "[] [ds*[000112]] [1448472995] sample string [1448472995] ***";
Regex RxBracket = new Regex(@"(\[\d+\])|\[(?>[^\[\]]+|\[(?<Depth>)|\](?<-Depth>))*(?(Depth)(?!))\]");

Match bracketMatch = RxBracket.Match(sTestSample);
while (bracketMatch.Success)
{
    if (bracketMatch.Groups[1].Success)
        Console.WriteLine("{0}",bracketMatch);
    bracketMatch = bracketMatch.Nextmatch();
}

产量

[1448472995]
[1448472995]