c# - 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，我想使用 Regex 将 [ 替换为 {，但是如果 [ 是转义了，忽略它，像这样:

abc[def\[ghi

到

abc{def\[ghi

我该怎么做？非常感谢!

Answer 1

使用这个:

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);