I use this: `url.replace("(?<!https?:)//".toReg...

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[Czar]

I use this: url.replace("(?<!https?:)//".toRegex(), "/") I have it as an extension function in relevant module.
But impact is not really noticeable. I haven't run any benchmarks though. And Regex is actually a final val, here it's inlined for brevity.