[Solved] REGEX – Get specific values [closed]

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If this is an exercise in using Regular Expressions, so you really want to use a Regular Expression to solve it, you can do something like this:

regex = /^(PL|PH|MH|M)$/

choices = ["PL", "PH", "M", "MH", "other", "invalid", "value"]
index = Math.floor(Math.random() * choices.length)
input = choices[index]
console.log("Testing", '"'+input+'"')

x = input.match(regex) 
if (x) {
  x = x[0]
}

console.log("Output:", x) // << one of the allowed strings, or null

Press [ (>) Run code snippet ] multiple times to see different output values.

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solved REGEX – Get specific values [closed]