This regex shows a warning in IntelliJ: `Redundant character escape '\\]' in RegExp` However, if I ...

# intellij

[Tóth István Zoltán]

This regex shows a warning in IntelliJ: Redundant character escape '\\]' in RegExp

However, if I remove it, browsers complain about invalid regex.

Did I miss something?

private val imageLinkRegex = "!\\[[^\\[]+\\]\\([^)]+\\)".toRegex()

[Klitos Kyriacou]

IntelliJ seems correct. Paste your regex into regex101.com. Then in another tab, paste the same regex without escaping the "]". Compare the difference between the two tabs.

[hfhbd]

Regex implementations are different based on each platform, so I really recommend to test it on each platform and not blindly trust IntelliJ focussing on JVM.

[Rob Elliot]

Chrome 126.0.6478.127 accepts const re = new RegExp("!\\[[^\\[]+]\\([^)]+\\)"); (i.e. no escape) for me

[Rob Elliot]

As does Firefox 126.0.1

[Adam S]

There are two things to improve:

• regex is different per KMP target, +1 this issue https://youtrack.jetbrains.com/issue/KT-49557/Different-dialects-of-regular-expressions-in-JS-and-other-platforms
• IJ inspections only consider the Java regex engine. I don't know if there's a youtrack issue for this