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e? re{ n} re{ n,} re{ n, m} Matches 0 or 1 occurrence of preceding expression. Matches exactly n number of occurrences of preceding expression. Matches n or more occurrences of preceding expression. Matches at least n and at most m occurrences of preceding expression. a|b Matches either a or b. (re) Groups regular expressions and remembers matched text. (?: re) Groups regular expressions without remembering matched text. (?> re) Matches independent pattern without backtracking. \\w \\W \\s \\S Matches word characters. Matches nonword characters. Matches whitespace. Equivalent to [\t\n\r\f]. Matches nonwhitespace. \\d Matches digits. Equivalent to [0-9]. \\D \\A \\Z \\z \\G \\n \\b \\B \\n, \\t, etc. \\Q Matches nondigits. Matches beginning of string. Matches end of string. If a newline exists, it matches just before newline. Matches end of string. Matches point where last match finished. Back-reference to capture group number "n" Matches word boundaries when outside brackets. Matches backspace (0x08) when inside brackets. Matches nonword boundaries. Matches newlines, carriage returns, tabs, etc. Escape (quote) all characters up to \\E \\E Ends quoting begun with \\Q Regular-expression Examples: Example Description . Match any character except newline [Rr]uby rub[ye] [aeiou] Match "Ruby" or "ruby" Match "ruby" or "rube" Match any one lowercase vowel TUTORIALS POINT Simply Easy Learning
[0-9] Match any digit; same as [0123456789] [a-z] [A-Z] [a-zA-Z0-9] [^aeiou] [^0-9] Match any lowercase ASCII letter Match any uppercase ASCII letter Match any of the above Match anything other than a lowercase vowel Match anything other than a digit \\d Match a digit: [0-9] \\D \\s \\S \\w \\W ruby? ruby* ruby+ \\d{3} \\d{3,} \\d{3,5} \\D\\d+ (\\D\\d)+/ ([Rr]uby(, )?)+ Match a nondigit: [^0-9] Match a whitespace character: [ \t\r\n\f] Match nonwhitespace: [^ \t\r\n\f] Match a single word character: [A-Za-z0-9_] Match a nonword character: [^A-Za-z0-9_] Match "rub" or "ruby": the y is optional Match "rub" plus 0 or more ys Match "rub" plus 1 or more ys Match exactly 3 digits Match 3 or more digits Match 3, 4, or 5 digits No group: + repeats \\d Grouped: + repeats \\D\d pair Match "Ruby", "Ruby, ruby, ruby", etc. Note that every backslash appears twice in the string above. This is because in Java and <strong>Scala</strong> a single backslash is an escape character in a string literal, not a regular character that shows up in the string. So instead of .\. you need to write .\\. to get a single backslash in the string. Check the following example: import scala.util.matching.Regex object Test { def main(args: Array[String]) { val pattern = new Regex("abl[ae]\\d+") val str = "ablaw is able1 and cool" } } println((pattern findAllIn str).mkString(",")) When the above code is compiled and executed, it produces the following result: C:/>scalac Test.scala TUTORIALS POINT Simply Easy Learning
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Scala Tutorial
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ABOUT THE TUTORIAL Scala Tutorial S
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FLOATING POINT LITERALS ...........
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Scala Strings .....................
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CHAPTER 1 Scala Overview Scala, sho
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CHAPTER 2 Scala Environment Setup T
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$scala -version Scala code runner v
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} * This will print 'Hello World' a
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forSome If implicit import Lazy Mat
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CHAPTER 4 Scala Data Types Scala ha
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Characters must not necessarily be
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Variable Type Inference: When you a
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The access to f in class Sub is OK
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var a = 10; var b = 20; var c = 25;
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} } println("a && b = " + (a&&b) );
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a >>> 15 C:/> Assignment Operators:
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Here, operators with the highest pr
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} If the boolean expression evaluat
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Nested if...else Statement: It is a
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while loop do...while loop for loop
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Flow Diagram: Example: object Test
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When the above code is compiled and
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} } // for loop execution with mult
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Flow Diagram: Example: import scala
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Infinite Loop: A loop becomes infin
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} } return sum A function, which do
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When the above code is compiled and
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} When the above code is compiled a
Page 57 and 58: } logWithDateBound("message1" ) log
Page 59 and 60: CHAPTER 12 Scala Strings Consider t
Page 61 and 62: } } var str2 = "Tod"; println("Dot
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Page 65 and 66: CHAPTER 13 Scala Arrays Scala provi
Page 67 and 68: C:/> Multi-Dimensional Arrays: Ther
Page 69 and 70: C:/> Scala Arrays Methods: Followin
Page 71 and 72: Scala Lists Scala Lists are quite s
Page 73 and 74: Creating Uniform Lists: You can use
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Page 77 and 78: var s = Set(1,3,5,7) While defining
Page 79 and 80: C:/> Scala Set Methods: Following a
Page 81 and 82: elements. 38 39 40 41 42 43 44 45 4
Page 83 and 84: use two maps with ++ as method colo
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Page 87 and 88: val t = new Tuple3(1, "hello", Cons
Page 89 and 90: The method will return Some[Person]
Page 91 and 92: 6 7 8 9 10 11 12 13 14 def filter(p
Page 93 and 94: Scala Iterator Methods: Following a
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Page 97 and 98: CHAPTER 15 Scala Classes & Objects
Page 99 and 100: } } println ("Point y location : "
Page 101 and 102: CHAPTER 16 Scala Traits A trait enc
Page 103 and 104: CHAPTER 17 Scala Pattern Matching P
Page 105 and 106: } // case class, empty one. case cl
Page 107: } When the above code is compiled a
Page 111 and 112: CHAPTER 19 Scala Exception Handling
Page 113 and 114: CHAPTER 20 Scala Extractors An extr
Page 115 and 116: CHAPTER 21 Scala Files I/O Scala is
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