chapter 05 examples

Author: cocoa

chapter_05/beginnings_and_endings.rb

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+content = 'The Princess And The Monkey
+
+Once upon a time there was a princess...
+...and they all lived happily ever after.
+
+The End'
+
+
+# it matches the regexp at 29
+/Once upon a time/ =~ content # 29
+
+# starts with -> \A
+/\AOnce upon a time/ =~ content # nil
+
+# ends with -> \z
+/and they all lived happily ever after\z/ =~ content # nil
+
+# the circumflex ^ to match the beginning of the content or 
+# the beginning of any new line within the content
+puts "Found it! at the beginning..." if content =~ /^Once upon a time/
+
+# the dolar sign $ to match the ending of the content or
+# the ending of any new line within the content
+puts "Found it! at the ending..." if content =~ /ever after\.$/
+
+# m modifier at the ending of the regular expresion turns on
+# the match between lines
+puts "catched!" if /^Once upon a time.*ever after\.$/m =~ content

chapter_05/regular_expresions_in_ruby.rb

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+the_time = '10:24 PM'
+
+puts /\d\d:\d\d (AM|PM)/ =~ the_time # 0
+
+puts /PM/ =~ the_time # 6
+
+
+# if there is not match, it will return nil
+may_match = /May/ =~ 'Sometime in June'
+puts may_match.inspect
+
+
+# =~ operator is ambidextrous
+puts "It's not morning!" if /PM/ =~ the_time
+puts "It's not morning!" if the_time =~ /PM/
+
+
+# you can turn case sensitivity OFF
+puts "It matches!" if /AM/i =~ 'am'
+
+
+# obscure_times! method
+class Document
+  attr_accessor :content
+
+  def initialize(content)
+    @content = content
+  end
+
+  def obscure_times!
+    @content.gsub!( /\d\d:\d\d (AM|PM)/i , '**:** **')
+  end
+end
+
+oclock = Document.new('12:00 am').obscure_times!
+puts oclock