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Check if a string matches a regular expression

Display "ok" if "Hello" matches /[A-Z][a-z]+/
scala
if ("Hello".matches("[A-Z][a-z]+")) println("ok")

Check if a string matches with groups

Display "two" if "one two three" matches /one (.*) three/
scala
val m = Pattern.compile("one (.*) three").matcher("one two three")
if (m.matches) println(m.group(1))