SCALA DUMP ZONE

• Start with an input string, call it input.
• Define a regex pattern, call it pattern, and add .r to the end to convert it into a scala.util.matching.Regex.
• Define values as val pattern(val1, val2, ...) = input

This example regex finds the two sentences and saves them as individual values.

scala> val testString = "I am a sentence. I am another sentence."
testString: String = I am a sentence. I am another sentence.

scala> val pattern = "^(.*)\\.\\s(.*)\\.$".r
pattern: scala.util.matching.Regex = ^(.*)\.\s(.*)\.$

scala> val pattern(sentenceOne, sentenceTwo) = testString
sentenceOne: String = I am a sentence
sentenceTwo: String = I am another sentence

• Start with an input string, call it input.
• Define a regex pattern, call it pattern, and add .r to the end to convert it into a scala.util.matching.Regex.
• Define values as val output = (pattern.findAllIn(input)) (or use infix notation) and convert it into a List by appending .toList.

This example regex finds all numbers in a string and puts them in a List.

scala> val input = "12345 abc abc 67890"
input: String = 12345 abc abc 67890

scala> val pattern = "\\d".r
pattern: scala.util.matching.Regex = \d

scala> val ints = (pattern findAllIn input).toList
ints: List[String] = List(1, 2, 3, 4, 5, 6, 7, 8, 9, 0)

• Start with an input string, call it input.
• Define a regex pattern, call it pattern.
• Check the string matches with input.matches(regex)

This example regex is for a valid time for a 24hr clock.

scala> val regex = "^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$"
regex: String = ^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$

scala> val testStringOne = "12:59"
testStringOne: String = 12:59

scala> val testStringTwo = "12:60"
testStringTwo: String = 12:60

scala> testStringOne.matches(regex)
res0: Boolean = true

scala> testStringTwo.matches(regex)
res1: Boolean = false