CODEWITHSUNDEEP
c#regex
edgarmtze
edgarmtze

Reputation: 25048

C# count ocurrences of several char in string using regex.Matches.count once

Having a string like:

0x1TTTT10TT1Tx01Tx1001xxx100T0TxT1T1TxTxTxx0TT0000000x0xTxT1Tx0T0x10x1

I want to get:

 0 appears 20
 1 appears 12 
 x appears 17
 T appears 21

If I use 

        int zero = Regex.Matches(input, "0").Count;
        int one  = Regex.Matches(input, "1").Count;
        int x    = Regex.Matches(input, "x").Count;
        int T    = Regex.Matches(input, "T").Count;

How to accomplish same result using more efficient approach using Regex?

Upvotes: 0

Views: 227

Answers (1)

Lukazoid
Lukazoid

Reputation: 19416

This is not really the real purpose of Regular Expressions. I would instead advise the use of a loop over the characters, like the following:

int zeroCount = 0;
int oneCount = 0;
int xCount = 0;
int tCount = 0;
foreach(var ch in input)
{
    switch(ch)
    {
        case '0':
            zeroCount++;
            break;
        case '1':
            oneCount++;
            break;
        case 'x':
            xCount++;
            break;
        case 'T':
            tCount++;
            break;
    }
}

Unfortunately the most efficient isn't usually the most concise.

Upvotes: 1

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