使用正則表達式替換字符，但不代替轉義字符

Question

我有一個字符串，我想用Regex更換[到{，但如果[被轉義，忽略它，就像這樣：

abc[def\[ghi 

到

abc{def\[ghi 

我該怎麼做？非常感謝你！

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);