CODEWITHSUNDEEP
c#regexstringparsing
Birdman
Birdman

Reputation: 1524

Parsing a string C# (Possibly with Regex)

I am trying to parse a line of code for a mathematical operation.

Such as: 4+18/(9-3)

I want the sections to be: 4, +, 18, /, (, 9, -, 3, and ). So basically, all numbers, operators, and parenthesis.

If I use split with delimiters it removes the delimiter upon finding it. So if I use my operators as delimiters, well then they're removed.

I tried using Regex.split and it INCLUDES the operator, but not how I want it. It produces results like 4+, since it includes the 4 and the plus.

Here's what I've been trying:

        string convert = "4+8/(9-3)";

        string[] parts = Regex.Split(convert, @"(?<=[-+*/])");

Upvotes: 2

Views: 99

Answers (2)

Prime
Prime

Reputation: 2482

As per my comment if you intend to use this to evaluate a math expression you should not use Regex as you cannot have any syntactic or semantic understanding of a string you're parsing.

If you're not intending to do that, this should work fine

([\d\.]+|[()e^/%x*+-])

Regexr example

Dotnetfiddle example

Upvotes: 4

nicael
nicael

Reputation: 18997

Well, I guess the problem could be solved with the help of the following regex. 

[-+*/\(\)]|\d+

Upvotes: -1

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