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在正则表达式是想要匹配 [ 和 ] 需要用 双斜杠 \ 双重转义:
// 字符串
string characterString = "{[1,2,3,4],'aaa'}";
//根据正则匹配
Match matchData = Regex.Match(characterString, "(\\[).*?(\\])",
RegexOptions.IgnoreCase);