使用正则表达式替换字符，但不要替换转义字符

Question

我有一个字符串，我希望使用Regex将[替换为{，但如果[被转义，请忽略它，如下所示：

abc[def\[ghi

到

abc{def\[ghi

我该怎么做？非常感谢你！

Answer 1

使用此：

Regex regexObj = new Regex(
    @"(?<=     # Make sure that this is true before the start of the match:
     (?<!\\)   # There is no single backslash,
     (?:\\\\)* # but if there are backslashes, they need to be an even number.
    )          # End of lookbehind assertion.
    \[         # Only then match a bracket", 
    RegexOptions.IgnorePatternWhitespace);