reasonable replaceAll

gistfile1.scala

import scala.util.matching.Regex
import java.util.regex.Matcher

def replaceAllByString(r: Regex, s: String, f: Matcher => String) = {
  val m = r.pattern.matcher(s)

  m.reset()
  var lastAppendPos = 0
  var result = m.find()
  if (result) {
    val sb = new java.lang.StringBuilder(s.length)
    do {
      sb.append(s, lastAppendPos, m.start())
      //sb.append(f(new Regex.Match(s, m, Seq()).force))
      sb.append(f(m))
      lastAppendPos = m.end()
      result = m.find()
    } while (result)

    //appendTail(sb);
    sb.append(s, lastAppendPos, s.length)

    sb.toString

  } else {
    s
  }
}