import scala.util.matching.Regex
val numberPattern: Regex = "[0-9]".r
numberPattern.findFirstMatchIn("awesomepassword") match {
case Some(_) => println("Password OK")
case None => println("Password must contain a number")
}
Password must contain a number
import scala.util.matching.Regex numberPattern: Regex = [0-9]
In the above example, the numberPattern
is a Regex
(regular expression) which we use to make sure a password contains a number.
You can also search for groups of regular expressions using parentheses.
import scala.util.matching.Regex
val keyValPattern: Regex = "([0-9a-zA-Z-#() ]+): ([0-9a-zA-Z-#() ]+)".r
val input: String =
"""background-color: #A03300;
|background-image: url(img/header100.png);
|background-position: top center;
|background-repeat: repeat-x;
|background-size: 2160px 108px;
|margin: 0;
|height: 108px;
|width: 100%;""".stripMargin
for (patternMatch <- keyValPattern.findAllMatchIn(input))
println(s"key: ${patternMatch.group(1)} value: ${patternMatch.group(2)}")
key: background-color value: #A03300 key: background-image value: url(img key: background-position value: top center key: background-repeat value: repeat-x key: background-size value: 2160px 108px key: margin value: 0 key: height value: 108px key: width value: 100
import scala.util.matching.Regex keyValPattern: Regex = ([0-9a-zA-Z-#() ]+): ([0-9a-zA-Z-#() ]+) input: String = """background-color: #A03300; background-image: url(img/header100.png); background-position: top center; background-repeat: repeat-x; background-size: 2160px 108px; margin: 0; height: 108px; width: 100%;"""
Here we parse out the keys and values of a String. Each match has a group of sub-matches. Here is the output:
key: background-color value: #A03300
key: background-image value: url(img
key: background-position value: top center
key: background-repeat value: repeat-x
key: background-size value: 2160px 108px
key: margin value: 0
key: height value: 108px
key: width value: 100