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  1. object Main {
  2.   def main(args: Array[String]): Unit = {
  3.     val rex = "([^%]++|%[diouxXcs%])".r
  4.     val test = "The annual %% rate is %d% %."
  5.     val matches = rex.findAllMatchIn(test).toList
  6.     for ((a, b) <- matches zip matches.tail) {
  7.       if (a.end < b.start) {
  8.         println(test)
  9.         println(" " * a.end + "^")
  10.       }
  11.     }
  12.   }
  13. }
  14.  
Success #stdin #stdout 0.41s 321920KB
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The annual %% rate is %d% %.
                        ^
The annual %% rate is %d% %.
                          ^
https://ideone.com/qbgHXo
language:
Scala (scala 2.12.8)
created:
10 years ago
visibility:
secret

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