Add tasks for all the new languages

Task/Regular-expressions/Swift/regular-expressions-1.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+let str = "I am a string"
+if let range = str.rangeOfString("string$", options: .RegularExpressionSearch) {
+  println("Ends with 'string'")
+}

Task/Regular-expressions/Swift/regular-expressions-2.swift

@@ -0,0 +1,5 @@
+import Foundation
+
+let orig = "I am the original string"
+let result = orig.stringByReplacingOccurrencesOfString("original", withString: "modified", options: .RegularExpressionSearch)
+println(result)

Task/Regular-expressions/Swift/regular-expressions-3.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+if let regex = NSRegularExpression(pattern: "string$", options: nil, error: nil) {
+  let str = "I am a string"
+  if let result = regex.firstMatchInString(str, options: nil, range: NSRange(location: 0, length: count(str.utf16))) {
+    println("Ends with 'string'")
+  }
+}

Task/Regular-expressions/Swift/regular-expressions-4.swift

@@ -0,0 +1,5 @@
+  for x in regex.matchesInString(str, options: nil, range: NSRange(location: 0, length: count(str.utf16))) {
+    let match = x as! NSTextCheckingResult
+    // match.range gives the range of the whole match
+    // match.rangeAtIndex(i) gives the range of the i'th capture group (starting from 1)
+  }

Task/Regular-expressions/Swift/regular-expressions-5.swift

@@ -0,0 +1,7 @@
+import Foundation
+
+let orig = "I am the original string"
+if let regex = NSRegularExpression(pattern: "original", options: nil, error: nil) {
+let result = regex.stringByReplacingMatchesInString(orig, options: nil, range: NSRange(location: 0, length: count(orig.utf16)), withTemplate: "modified")
+  println(result)
+}