Expression Evaluator

Question

 

Dear All

I couldn't find a method to evaluate a regular expression in C#

Ex: string exp="(3+5)/2-1";

I hope if anyone could hep.

Answer 1

They're in System.Text.RegularExpressions.Regex class.  Try IsMatch and Match methods.

 

Answer 2

Are you really looking for regular expression capabilities, or are you looking to evaluate the math expression you provided as an example to 3?  .NET doesn't provided math expression evaluation out of the box.  You will either need to look for a library online to provide that functionality or write your own.  You could try here.

Answer 3

An relatively cheap expression evaluator can be found in DataColumn and it's Expression property, eg:

Code Snippet

DataTable dt = new DataTable();
DataRow dr = dt.Rows.Add();
DataColumn dc = dt.Columns.Add();
dc.Expression = "(3+5)/2-1";

Console.WriteLine( dr[0] );

Answer 4

Check out LazyParser.NET, a full-featured lightweight C# expression parser.