compile time regex check and string interpolators

README.md

• inspired by macrocosm and inkytonik's blog post
• Can not use if $ character contains. Does anyone have a solution? :(

Macros.scala

import scala.reflect.macros.Context
import scala.util.matching.Regex
import java.util.regex.PatternSyntaxException

object Macros{

  implicit class RegexContext(val c: StringContext) {
    def r(): Regex = macro regexImpl
  }

  def regexImpl(c: Context)(): c.Expr[Regex] = {
    import c.universe._
    c.prefix.tree match {
      case Apply(_,List(Apply(_,List(Literal(Constant(str: String)))))) =>
        try{
          str.r
        }catch{
          case e: PatternSyntaxException => c.abort(c.enclosingPosition, e.toString)
        }
        val Apply(fun, _) = reify(new Regex("")).tree
        c.Expr[Regex](Apply.apply(fun, c.literal(str).tree :: Nil))
    }
  }

}

Main.scala

import Macros._

object Main extends App{
  println(r"foo|bar") // compile success !
  println(r"[foo") // compile error !
  println(r"foo$") // error: invalid string interpolation: `$$', `$'ident or `$'BlockExpr expected 
}

Would this be even simpler with quasiquotes? Also, any solution for the $ problem?