include/scala/ch06/CheckPattern.scala @@ -2027,57 +2027,55 @@ assert(matches.isEmpty) // @@PLEAC@@_6.4 //---------------------------------------------------------------------------------- -// TODO -str = 'groovy.codehaus.org and www.aboutgroovy.com' -re = '''(?x) # to enable whitespace and comments +val str = "www.scala-lang.org and scala.sygneca.com" +val re = """(?x) # to enable whitespace and comments ( # capture the hostname in $1 (?: # these parens for grouping only (?! [-_] ) # lookahead for neither underscore nor dash - [\\w-] + # hostname component - \\. # and the domain dot + [\w-] + # hostname component + \. # and the domain dot ) + # now repeat that whole thing a bunch of times [A-Za-z] # next must be a letter - [\\w-] + # now trailing domain part + [\w-] + # now trailing domain part ) # end of $1 capture - ''' - -finder = str =~ re -out = str -(0..<finder.count).each{ - adr = finder[it][0] - out = out.replaceAll(adr, "$adr [${InetAddress.getByName(adr).hostAddress}]") -} -println out -// => groovy.codehaus.org [63.246.7.187] and www.aboutgroovy.com [63.246.7.76] + """.r // the .r creates a scala.util.matching.Regex +val withIp = re.findAllIn(str).map { s => + val ipaddr = java.net.InetAddress.getByName(s).getHostAddress() + s + " [" + ipaddr + "]" +}.mkString(" ") +println(withIp) +// www.scala-lang.org [128.178.154.159] scala.sygneca.com [83.142.230.29] // to match whitespace or #-characters in an extended re you need to escape them. -foo = 42 -str = 'blah #foo# blah' -re = '''(?x) # to enable whitespace and comments - \\# # a pound sign - (\\w+) # the variable name - \\# # another pound sign - ''' -finder = str =~ re -found = finder[0] -out = str.replaceAll(found[0], evaluate(found[1]).toString()) -assert out == 'blah 42 blah' +val foo = "42" +val str = "blah #foo# blah" +val re = """(?x) # to enable whitespace and comments + \# # a pound sign + (\w+) # the variable name + \# # another pound sign + """.r // the .r creates a scala.util.matching.Regex +val out = re.replaceAllIn(str, foo) +assert(out == "blah 42 blah") //---------------------------------------------------------------------------------- // @@PLEAC@@_6.5 //---------------------------------------------------------------------------------- // TODO -fish = 'One fish two fish red fish blue fish' -expected = 'The third fish is a red one.' -thirdFish = /(?:\w+\s+fish\s+){2}(\w+)\s+fish.*/ -assert expected == (fish.replaceAll(thirdFish, 'The third fish is a $1 one.')) +val fish = "One fish two fish red fish blue fish" +val expected = "The third fish is a red one." +val re = """(\w+)\sfish\b""".r +// convert MatchIterator to Iterator[Match] to access groups, +// drop the first 2 matches (we want the third fish), +// get the match (next), get group 1 +val thirdFish = re.findAllIn(fish).matchData.drop(2).next.group(1) +assert(expected == "The third fish is a " + thirdFish + " one.") -anyFish = /(\w+)\s+fish\b/ -finder = fish =~ anyFish -// finder contains an array of matched groups -// 2 = third one (index start at 0), 1 = matched word in group -out = "The third fish is a ${finder[2][1]} one." -assert out == expected +val fish = "One fish two fish red fish blue fish" +val expected = "The third fish is a red one." +val re = """(?:\w+\s+fish\s+){2}(\w+)\s+fish""".r +val thirdFish = re.findFirstMatchIn(fish).get.group(1) +val out = "The third fish is a " + thirdFish + " one." +assert(expected == out) evens = [] (0..<finder.count).findAll{it%2!=0}.each{ evens += finder[it][1] } @@ -2420,28 +2418,7 @@ assert input.findAll{ matchAll(it, ['cat$','^n.*']) }.size() == 0 // @@PLEAC@@_6.11 //---------------------------------------------------------------------------------- -// TODO -// patternCheckingScript: -prompt = '\n> ' -print 'Enter patterns to check:' + prompt -new BufferedReader(new InputStreamReader(System.in)).eachLine{ line -> - try { - Pattern.compile(line) - print 'Valid' + prompt - } catch (java.util.regex.PatternSyntaxException ex) { - print 'Invalid pattern: ' + ex.message + prompt - } -} -// => -// Enter patterns to check: -// > ab*.c -// Valid -// > ^\s+[^a-z]*$ -// Valid -// > ** -// Invalid pattern: Dangling meta character '*' near index 0 -// ** -// ^ +// @@INCLUDE include/scala/ch06/CheckPattern.scala //---------------------------------------------------------------------------------- // @@PLEAC@@_6.12 pleac_scala.data dc8fbed46393fdd55860099391ddeb00b2c84443 Michael Kebe michael.kebe@gmail.com http://github.com/michaelkebe/pleac-scala/commit/2a200528c68fd1e708863524be4287585ddf06d6 2a200528c68fd1e708863524be4287585ddf06d6 2009-07-02T12:52:39-07:00 2009-07-02T12:52:39-07:00 PLEACs 6.4, 6.5, 6.11 235b71fd6914de8330b99178cc53fa0d31323e57 Michael Kebe michael.kebe@gmail.com