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regular-expression-patterns.md

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tour
Regularni izrazi
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scala-tour
15
extractor-objects
singleton-objects

Regularni izrazi su stringovi koji se mogu koristiti za traženje uzoraka u podacima. Bilo koji string se može pretvoriti u regularni izraz pozivom .r metode.

importscala.util.matching.RegexvalnumberPattern:Regex="[0-9]".r numberPattern.findFirstMatchIn("awesomepassword") match { caseSome(_) => println("Password OK") caseNone=> println("Password must contain a number") }

U gornjem primjeru, numberPattern je Regex (regularni izraz) kojim provjeravamo da li šifra sadrži broj.

Također, možete tražiti grupe regularnih izraza koristeći zagrade.

importscala.util.matching.RegexvalkeyValPattern:Regex="([0-9a-zA-Z-#() ]+): ([0-9a-zA-Z-#() ]+)".r valinput: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)}")

Ovdje parsiramo ključeve i vrijednosti Stringa. Svaki pogodak ima grupu pod-pogodaka. Ovo je izlaz:

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
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