c# - 使用正则表达式替换字符但不替换转义字符

Question

我有一个字符串，我想用它Regex来替换[to {，但如果[被转义，请忽略它，如下所示：

abc[def\[ghi

至

abc{def\[ghi

我怎样才能做到这一点？非常感谢！

Answer 1

用这个：

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);