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object Main extends App {
	val a = "aaaabbbcccss"
	val p = "([ab])\\1*".r
	println(p replaceAllIn (a, m => s"${m.group(1)}${m.group(0).size}") )
}

Success #stdin #stdout 0.4s 2181632KB

stdin

Standard input is empty

stdout

a4b3cccss

https://ideone.com/HuIpqA

language:

Scala (scala 2.12.8)

created:

visibility:

secret

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