Commit.scala

case class Commit(id: String, title: String)

val taskNamePattern = "[a-zA-Z]{3,4}-[0-9]{3,4}".r

val commits = Seq(
  Commit("1", "TST-123"),
  Commit("1", "TST-123"),
  Commit("2", "TST-2234"),
  Commit("3", "TST-31234"),
  Commit("4", "TST-4232"),
  Commit("5", "TST-523"),
  Commit("5", "TST123123123123-5 nkajsdnkajsnd")
)

commits flatMap (c => taskNamePattern.findFirstIn(c.title)) map ("jira/" + _)