C#

Parsing a postfix expression in C#, my naive approach

YangChunJiang

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19 Dec 2010CPOL 11.3K   1   3

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.

Regex combined = 
                new Regex(@"\G(\s+(?<op>[+-*/])|\s*(?<value>-?[0-9]+))", RegexOptions.ExplicitCapture);</op>

This line has an error:

parsing "\G(\s+(?<op>[+-*/])|\s*(?<value>-?[0-9]+))" - [x-y] range in reverse order.

License

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

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YangChunJiang

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Comments and Discussions

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I expect it is the - in the first group.. changing it to [-+... Morten Nilsen21-Dec-10 0:32 Morten Nilsen 21-Dec-10 0:32  I expect it is the - in the first group.. changing it to [-+*/] should hopefully work. Reason for my vote of 1 This is a valid comment, but doesn't... Darchangel6-Dec-10 2:53 Darchangel 6-Dec-10 2:53  Reason for my vote of 1 This is a valid comment, but doesn't belong in the Alternate area. Reason for my vote of 1 This is really a comment, not an Alt... Toli Cuturicu4-Dec-10 7:42 Toli Cuturicu 4-Dec-10 7:42  Reason for my vote of 1 This is really a comment, not an Alternate, isn't it?

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