如何实现不依赖后行断言（lookbehind）的Safari兼容正则表达式

Hey there! I’ve run into this exact Safari regex limitation before, so I know how frustrating it can be. Here’s a pure regex solution that works without lookbehind assertions and fits your CodeMirror constraints perfectly:

The Replacement Regex #

(?:^|[^\\])(}})

Breakdown of How It Works #

• (?:^|[^\\]): This non-capturing group handles two valid scenarios for the characters before }}:
  • ^: The start of the string (so }} at the very beginning is matched)
  • [^\\]: Any character that isn’t a backslash (ensuring we skip }} sequences immediately preceded by an unescaped \)
• (}}): This capturing group targets the actual }} sequence you need to match.

Testing Against Your Example #

Let’s verify with your sample text:

%{{Hello this is a test with escaping \}} and the end should be here: }}

• The \\}} portion (which translates to \}} in the actual string) won’t trigger a match, since the }} is preceded by a backslash that fails the [^\\] check.
• The final }} at the end will be correctly captured in the first capturing group, just like your original regex intended.

CodeMirror Integration #

Since CodeMirror supports using capturing groups to isolate the relevant part of a match, you can use this regex and reference group 1 to get the valid }} sequences. No extra JavaScript post-processing is needed—this regex directly targets the correct matches while excluding the escaped cases.

内容的提问来源于stack exchange，提问作者Marcel Frank