string.split is not working when logical operator is present in the String

Question

I am having a string ">= 50.80" I am trying split logical operator and float value using below

val result = ">= 50.80"
val Pattern = "(<[=>]?|==|>=?|\\&\\&|\\|\\|)".r
val Pattern(operator) = result
println(operator)

Error:

Exception in thread "main" scala.MatchError: >= 50.80 (of class java.lang.String).

What doesn't work? It splits on `>=`, so it will be splitted into an array like `["", " 50.80"]`, making index `0` the empty string...? — Narigo, Jul 14 '20 at 19:57
Okie. I made a mistake. I want to split into [">=" , " 50.80"]. I want to support multiple logical operators such `<,>,==,<=,=>`. Sometime space will not present between logical operator and float value — Arvinth, Jul 14 '20 at 20:02

score 1 · Accepted Answer · answered Jul 14 '20 at 20:21

According to this answer, negative lookbehind and lookahead can be leveraged to keep delimiters.

val result = ">= 50.80"
val str_split = result.split("(?<=(<[=>]?|==|>=|\\&\\&|\\|\\|))|(?=(<[=>]?|==|>=|\\&\\&|\\|\\|))")

for (v <- str_split) {
  println(v)
}

string.split is not working when logical operator is present in the String

1 Answers1