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

extras/imported/ruby-mode/Blocks/lambda { |args| .. } (lam).yasnippet

@@ -2,5 +2,6 @@
 # key: lam
 # contributor: Translated from TextMate Snippet
 # name: lambda { |args| .. }
+# expand-env: ((yas/wrap-around-region t))
 # --
-lambda { ${1/(^(?<var>\s*(?:\*|\*?[a-z_])[a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1:|)/}${1:args}${1/(^(?<var>\s*(?:\*|\*?[a-z_])[a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1:| )/}$0 }
+lambda { ${1:$(if (string= yas/text "") "" "|")}${1:variable}${1:$(if (string= yas/text "") "" "|")} $0 }

extras/imported/ruby-mode/Blocks/open yield block ({).yasnippet

@@ -2,5 +2,6 @@
 # key: {
 # contributor: Translated from TextMate Snippet
 # name: Insert { |variable| … }
+# expand-env: ((yas/wrap-around-region t))
 # --
-{ ${1/(^(?<var>\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1:|)/}${1:variable}${1/(^(?<var>\s*[a-z_][a-zA-Z0-9_]*\s*)(,\g<var>)*,?\s*$)|.*/(?1:| )/}${2:`yas/selected-text`} 
+{ ${1:$(if (string= yas/text "") "" "|")}${1:variable}${1:$(if (string= yas/text "") "" "|")} $0 } 

extras/imported/ruby-mode/Insert ERb's <% __ %> or <%= __ %>.yasnippet

@@ -2,5 +2,6 @@
 # contributor: Translated from TextMate Snippet
 # name: Insert ERb’s <% .. %> or <%= .. %>
 # binding: "^>"
+# expand-env: ((yas/wrap-around-region t))
 # --
-<%= `yas/selected-text`$0 %>
+<%= $0 %>