Get int array from string

Question

string str = "XXX_123_456_789_ABC";
int[] intAry = GetIntAryByStr(str);

Get int[] result like this int[0] <- 123 , int[1] <- 456 , int[2] <- 789

string str = "A111B222C333.bytes";
int[] intAry = GetIntAryByStr(str);

Get int[] result like this int[0] <- 111, int[1] <- 222 , int[2] <- 333

How to do it !?

You could extract all sequences of digits from the string using Regex.Matches(str, @"\d+") — Klaus Gütter
– Klaus Gütter, Commented Jan 14, 2022 at 7:16

Dmitrii Bychenko · Accepted Answer · 2022-01-14 07:17:15Z

4

You can try regular expressions in order to match all items:

using System.Linq;
using System.Text.RegularExpressions;

...

int[] intAry = Regex
  .Matches(str, "[0-9]+")
  .Cast<Match>()
  .Select(match => int.Parse(match.Value))
  .ToArray();

If array items must have 3 digits only, change [0-9]+ pattern into [0-9]{3}

answered Jan 14, 2022 at 7:17

Dmitrii Bychenko

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2 Comments

Yuriy Faktorovich Over a year ago

You don't need the Cast, although maybe it depends on .net version.

Dmitrii Bychenko Over a year ago

@Yuriy Faktorovich: older .Net versions require Cast<Match> (or OfType<Match>) since their MatchCollection doesn't implement IEnumerable<Match>

Lei Yang · Accepted Answer · 2022-01-14 07:22:10Z

2

Just to demonstrate what @Klaus Gütter suggests, and with linq:

        static int[] GetIntAryByStr(string s)
        {
            return Regex.Matches(s, @"\d+")
                .OfType<Match>()
                .Select(x => Convert.ToInt32(x.Value))
                .ToArray();
        }

answered Jan 14, 2022 at 7:22

Lei Yang

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