正则表达式需求：替换方括号外斜杠为>，现有模式失效

Got it, let's get your regex working correctly! You want to replace all / characters with > except those inside square brackets ([]), and your current pattern isn't hitting the mark.

The Problem with Your Original Regex #

Your regex @"\/(?=$|[^]]+\||\[[^]]+\]\/)" has a few logical inconsistencies:

• The [^]]+\|| part includes an unescaped | that acts as an OR operator, but it doesn't serve any useful purpose here
• It doesn't properly account for the full scope of square-bracketed blocks, so it fails to reliably exclude slashes inside [...]

The Correct Solution #

We need a regex that matches a / only if it's not inside any square brackets. Here's a pattern that does exactly that, along with working code:

string str = @"//div[1]/li/a[@href='https://www.facebook.com/']";
// Regex to match slashes NOT inside square brackets
string regexPattern = @"\/(?=(?:[^[\]]*\[[^[\]]*\])*[^[\]]*$)";
var result = Regex.Replace(str, regexPattern, ">");

What This Regex Does #

Let's break down the pattern to understand why it works:

• \/: Matches the literal / we want to replace
• (?=...): A positive lookahead that checks the content after the slash to ensure it meets our condition
  • (?:[^[\]]*\[[^[\]]*\])*: Matches any number of complete square-bracket blocks (e.g., [1], @href='https://www.facebook.com/') — this skips over all bracketed content
  • [^[\]]*$: Ensures that after any bracketed blocks, there are only non-bracket characters until the end of the string. This guarantees the slash we're matching isn't inside an unclosed bracket.

Expected Output #

Running the code above will give you exactly the result you want:

>>div[1]>li>a[@href='https://www.facebook.com/']

内容的提问来源于stack exchange，提问作者Sandeep Dhamale