http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660And I want to add that this is a nice candidate to be unit-tested with Microsoft Pex. Testing for all relevant inputs that this code does not crash (at the very least) would be an excercise of 2 minutes with pex. http://ayende.com/4742/solving-an-outofmemoryexception#comment8http://ayende.com/4742/solving-an-outofmemoryexception#comment8Fri, 07 Jan 2011 21:27:32 GMTInteresting and for many unexpected is the fact that you can actually manually implement what a regex does. It is like building a compiler: Many think it is nearly impossible without a phd but the ones who have actually done it know that it is not brain surgery. http://ayende.com/4742/solving-an-outofmemoryexception#comment7http://ayende.com/4742/solving-an-outofmemoryexception#comment7Fri, 07 Jan 2011 21:26:24 GMTOn a similiar situation, I've used a regular expression and a match evaluator to do the replacing. My expression looks for patterns that are a reference to a tree (a dictionary of dictionaries) and replaces the references with its values. http://ayende.com/4742/solving-an-outofmemoryexception#comment6http://ayende.com/4742/solving-an-outofmemoryexception#comment6Thu, 06 Jan 2011 11:24:21 GMT>At any rate, this code is much more complicated nice comments in the code too http://ayende.com/4742/solving-an-outofmemoryexception#comment5http://ayende.com/4742/solving-an-outofmemoryexception#comment5Thu, 06 Jan 2011 02:36:01 GMTWhy do you need to check that values aren't being followed by a digit? Is the problem if you've got a parameter @a1 and another parameter @a10? Because then @a10 would be replaced first anyway. http://ayende.com/4742/solving-an-outofmemoryexception#comment4http://ayende.com/4742/solving-an-outofmemoryexception#comment4Thu, 06 Jan 2011 00:56:19 GMTAnother nice thing with Tobi's suggestion is that you won't get "double replaces". E.g. if the value of @a contains '...@b...', @b shouldn't be replaced and won't be with Tobi's way... Tobi, [\w\d_] can be \w instead. \w includes both digits and underscore... http://ayende.com/4742/solving-an-outofmemoryexception#comment3http://ayende.com/4742/solving-an-outofmemoryexception#comment3Wed, 05 Jan 2011 21:58:10 GMTTobi, This is a nice one :-) http://ayende.com/4742/solving-an-outofmemoryexception#comment2http://ayende.com/4742/solving-an-outofmemoryexception#comment2Wed, 05 Jan 2011 15:35:25 GMTYou could use Regex.Replace on the pattern @"@(? <paramname[\w\d_]{1,128})(?!\d|_)" and in the match handler you figure out which parameter was matched. That would do a single scan over the string. >http://ayende.com/4742/solving-an-outofmemoryexception#comment1http://ayende.com/4742/solving-an-outofmemoryexception#comment1Wed, 05 Jan 2011 15:19:43 GMT