Merge pull request rails#48414 from jhawthorn/faster_block_expr

Speed up ERB expression BLOCK_EXPR regex

Author: jhawthorn

actionview/lib/action_view/template/handlers/erb/erubi.rb

@@ -42,7 +42,7 @@ def add_text(text)
             end
           end
 
-          BLOCK_EXPR = /\s*((\s+|\))do|\{)(\s*\|[^|]*\|)?\s*\Z/
+          BLOCK_EXPR = /((\s|\))do|\{)(\s*\|[^|]*\|)?\s*\Z/
 
           def add_expression(indicator, code)
             flush_newline_if_pending(src)