Ruby solution for week 99, part 1

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diff --git a/challenge-099/abigail/ruby/ch-1.rb b/challenge-099/abigail/ruby/ch-1.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+#
+# Read a string and a pattern. Turn the pattern into a regular expression:
+#    - '?'  becames '.'
+#    - '*'  becomes '.*'
+#    - any other character will be quotemetaed.
+# 
+# Then map the string against the pattern, anchored.
+#
+
+ARGF . each_line do |_|
+    (string, pattern) = _ . strip . split
+    pattern . gsub! (/./) {|_| 
+         _ == "?"          ? "."
+      :  _ == "*"          ? ".*"
+      : (_ . match (/\W/)) ? "\\" + _
+      :  _}
+    pattern = "^" + pattern + "$"
+    puts (string . match (pattern)) ? 1 : 0
+end