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/post.scala

Created June 15, 2017 06:55
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post.scala
val regex = "(-?[1-9][0-9]*)|0".r
val stringToIntPrism = Prism[String, Int]{ str =>
if(regex.pattern.matcher(str).matches) {
Try(str.toInt).toOption
} else {
None
}
}(_.toString)
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