Make array out of specific characters in a string

Question

So lets say i have a string : "a = b + c - d"

I want to create a character array that will hold these expression signs(=,-,+,) and convert them to an array for example in this case the array would be {'=','+','-'}

example of the code:

   string s = "a = b + c -d"
   char[] array = s.???('=','-','+');

is there an easy way to this is without loops?

Thanks in advance :)

Do you have a list of operators you're looking for? Does the order in the resulting array matter? — rory.ap
– rory.ap, Commented Mar 10, 2017 at 13:03

Pikoh · Accepted Answer · 2017-03-10 13:06:30Z

4

You could use linq and do something like this:

char[] operators = new char[] { '=', '-', '+' };
string s = "a = b + c -d";
var opArray = s.Where(x=>operators.Contains(x)).ToArray();

You can add all the operators you need in the operators array

answered Mar 10, 2017 at 13:06

Pikoh

7,72331 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sergey Berezovskiy · Accepted Answer · 2017-03-10 13:24:23Z

2

You can use LINQ to select characters which are not letters or whitespace

var array = s.Where(c => !Char.IsLetter(c) && !Char.IsWhiteSpace(c)).ToArray();

Output:

[ '=',  '+',  '-' ]

You can also create extension method to make code more readable and select only math operators

public static class Extensions
{
    private static HashSet<char> mathOperators =
        new HashSet<char>(new[] { '+', '-', '=' }); // add more symbols here
    public static bool IsMathOperator(this char c) => mathOperators.Contains(c);
}

And usage

var array = s.Where(c => c.IsMathOperator()).ToArray();

edited Mar 10, 2017 at 13:24

answered Mar 10, 2017 at 13:07

Sergey Berezovskiy

237k44 gold badges441 silver badges468 bronze badges

3 Comments

Pikoh Over a year ago

This is a nice solution, but i may also add !Char.IsDigit(c), just in case

Sergey Berezovskiy Over a year ago

@Pikoh maybe list of valid operators is better in that case. That depends whether OP formulas use digits and whether there is lot of valid operators :)

Pikoh Over a year ago

that why i suggested my answer, but i agree, it depends on OP formulas :)

Collectives™ on Stack Overflow

Make array out of specific characters in a string

2 Answers 2

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related