constants.rb in regexp-examples-0.0.1

- old
+ new
@@ -1,11 +1,37 @@
 module RegexpExamples
   # Number of times to repeat for Star and Plus repeaters
   TIMES = 2
 
-  # Set of chars for Dot and negated [^] char groups
-  #CHARS = [("a".."z").to_a, ("A".."Z").to_a, ".", ",", ";"].flatten
-  #TODO: Make these character sets more complete
-  #e.g. Sets for \d, \w, \h, \s
-  CHARS = %w{a b c d e}
+  # Maximum number of characters returned from a char set, to reduce output spam
+  # For example:
+  # If MaxGroupResults = 5, then
+  # \d = [0, 1, 2, 3, 4]
+  MaxGroupResults = 5
+
+  module CharSets
+    Lower = Array('a'..'z')
+    Upper = Array('A'..'Z')
+    Digit = Array('0'..'9')
+    Punct = [33..47, 58..64, 91..96, 123..126].map { |r| r.map { |val| val.chr } }.flatten
+    Any = Lower | Upper | Digit | Punct
+  end
+
+  # Map of special regex characters, to their associated character sets
+  BackslashCharMap = {
+    'd' => CharSets::Digit,
+    'D' => CharSets::Lower | CharSets::Upper | CharSets::Punct,
+    'w' => CharSets::Lower | CharSets::Upper | CharSets::Digit | ['_'],
+    'W' => CharSets::Punct.reject { |val| val == '_' },
+    's' => [' ', "\t", "\n", "\r", "\v", "\f"],
+    'S' => CharSets::Any - [' ', "\t", "\n", "\r", "\v", "\f"],
+
+    't' => ["\t"], # tab
+    'n' => ["\n"], # new line
+    'r' => ["\r"], # carriage return
+    'f' => ["\f"], # form feed
+    'a' => ["\a"], # alarm
+    'v' => ["\v"], # vertical tab
+    'e' => ["\e"], # escape
+  }
 end
 