Simple String Substitution

Difficulty:
Easy

Tags:
strings

Instructions:
One of the challenges in implementing Rubeque is performing string substitution. See how well you can do.

Problem and Solution:

	# Solution to 'Simple String Substitution' on rubeque.com
	# by jakthegr8
	# http://www.rubeque.com/problems/simple-string-substitution
	class String
	def simple_sub(pattern, replace)
	gsub(/#{Regexp.escape(pattern)}/ ) {replace}
	end
	end
	subject = "?? == ??"
	assert_equal subject.simple_sub("==", "<="), "?? <= ??"
	assert_equal subject.simple_sub("abc", "def"), "?? == ??"
	assert_equal subject.simple_sub("??", "fun??"), "fun?? == fun??"
	naruse_answer = "Date.parse(date.sub(/(\d+)[-\/](\d\d).(\d{4})/,'\\3-\\1-\\2')).strftime('%b %d, %Y')"
	assert_equal subject.simple_sub("??", naruse_answer), "#{naruse_answer} == #{naruse_answer}"

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