Click here to Skip to main content
11,934,199 members (41,634 online)
Click here to Skip to main content
Add your own
alternative version

Tagged as


1 bookmarked

Parsing a postfix expression in C#, my naive approach

, 19 Dec 2010 CPOL
Regex combined = new Regex(@"\G(\s+(?[+-*/])|\s*(?-?[0-9]+))", RegexOptions.ExplicitCapture);This line has an error:parsing "\G(\s+(?[+-*/])|\s*(?-?[0-9]+))" - [x-y] range in reverse order.


Members may post updates or alternatives to this current article in order to show different approaches or add new features.

22 Nov 2010
3 alternatives  
There was a request about in Q&A. The question was deleted, anyway I think the subject may be interesting.
21 Dec 2010
Morten Nilsen
Here is my take on the same, using Lambda expressions and slightly more advanced regular expression features:I have not tested this code, so errors may exist.This implementation will ignore unrecognized tokens. namespace Postfix { class Parser { static Dictionary<string,...
21 Dec 2010
Andreas Gieriet
For those who like dense code, here is a sample :) - Make the dictionary static readonly, init directly- Swap the arguments in the lambda expressions and call by direct pop from the stack- Make the regex simpler and put the logic of parsing into the Exec (the regex only tokenizes the...


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

United States United States
No Biography provided

| | Privacy | Terms of Use | Mobile
Web03 | 2.8.151126.1 | Last Updated 19 Dec 2010
Article Copyright 2010 by YangChunJiang
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid