Tweaking the TextMate C snippets

extras/imported/ruby-mode/Blocks/do |obj| .. end (doo).yasnippet

@@ -3,6 +3,6 @@
 # contributor: Translated from TextMate Snippet
 # name: Insert do |variable| … end
 # --
-do${1/(^(?<var>\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1: |)/}${1:variable}${1/(^(?<var>\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1:|)/}
-	$0
+do ${1:$(if (string= yas/text "") "" "|")}${1:variable}${1:$(if (string= yas/text "") "" "|")}
+  $0
 end