Split string to digits and alphabets in c#

Question

I have a string like this

12,3 m and i need 2 sub strings one decimal value and one unit like 12,3 and m

12.3 will return 12.3 and m

123,4 c will return 123,4 and c

The decimal separators can be . or ,

So how can i get it in C# without iterating through every characters like below

char c;

for (int i = 0; i < Word.Length; i++)
{
  c = Word[i];

  if (Char.IsDigit(c))
    string1 += c;
  else
    string2 += c;
}

string input is not really needed to be formatted like this it can be like A12,3 m or ABC3.45 or 4.5 DEF etc. So string Split is not stable always

Did u try Regex.Split() to split your value based on , or . or whitespace depending upon how u wish to split — Megha, Aug 21 '15 at 09:55
are you splitting on the decimal character or on the whitespace between the number and the alphabetical character? — user1666620, Aug 21 '15 at 09:56
Yes can do a split and apply Regx , but looking for a single line solution — Sebastian, Aug 21 '15 at 09:57
it will give you a single line solution right? You dont need to iterate — Megha, Aug 21 '15 at 09:58
Furthermore ABC3.45 m = ABCm and 3.45 ? OR ABC and m and 3.45 or A and B and C and m and 3.45 ? — Paul Zahra, Aug 21 '15 at 10:20
possible duplicate of [How to separate character and number part from string](http://stackoverflow.com/questions/1968049/how-to-separate-character-and-number-part-from-string) — Paul Zahra, Aug 21 '15 at 10:21

user1666620 · Answer 1 · 2015-08-21T10:12:22.103

4

Looks like you are trying to split based on the whitespace character:

input = "12.3 c";
string[] stringArray = string.Split(input, ' ');

You can then do a float.Parse operation on the first element of the array. The decimal separator used by float.Parse would depend on your culture and if the wrong one is chosen you could get a FormatException.

You can also choose the decimal separator programatically through the below:

culture.NumberFormat.NumberDecimalSeparator = "."; // or ","

edited Aug 21 '15 at 10:12

answered Aug 21 '15 at 09:58

user1666620

4,800
18
27

string input is not really needed to be formatted like this it can be like A12,3 m or ABC3.45 or 4.5 DEF etc. So string Split is not stable always – Sebastian Aug 21 '15 at 10:03
3

@JibinMathew then put that information in your question, because it changes entirely the question and what the solutions are. Do you only want the numbers? – user1666620 Aug 21 '15 at 10:03
why the downvote? it answered the original question. – user1666620 Aug 21 '15 at 10:07
@JibinMathew you should make an EDIT to your original question more clear, e.g. EDIT: blah blah – Paul Zahra Aug 21 '15 at 10:16

score 0 · Answer 2 · answered Aug 21 '15 at 10:23

Checking your provided examples { "12,3 m", "A12,3 m", "ABC3.45", "4.5 DEF"} it seems that the string position can not only change but there can be 2 strings and one decimal in your inputstrings.

This solution will show you how to extract these data with only one regex and no manual string split. I will incorporate the CultureInfo from user1666620:

string[] inputStrings = new string[] { "12,3 m", "A12,3 m", "ABC3.45", "4.5 DEF"};
Regex splitterRx = new Regex("([a-zA-Z]*)\\s*([\\d\\.,]+)\\s*([a-zA-Z]*)");
List<Tuple<string, decimal, string>> results = new List<Tuple<string, decimal, string>>();
foreach (var str in inputStrings)
{ 
    var splitterM = splitterRx.Match(str);
    if (splitterM.Success)
    {
        results.Add(new Tuple<string, decimal, string>(
            splitterM.Groups[1].Value,
            decimal.Parse(
                splitterM.Groups[2].Value.Replace(".", System.Globalization.NumberFormatInfo.CurrentInfo.NumberDecimalSeparator).Replace(
                    ",", System.Globalization.NumberFormatInfo.CurrentInfo.NumberDecimalSeparator)
            ),
            splitterM.Groups[3].Value
        ));
    }
}

This will find all possible combinations of a present/not present string in pre/post position, so be sure to check the individual strings or apply any combining logik unto them.

Also it doesn't only check for the presence of a single space between the decimal and the strings but for the presence of any number of whitespaces. If you want to limit it to definately only 0 or 1 space instead replace the Regex with this:

Regex splitterRx = new Regex("([a-zA-Z]*)[ ]{0,1}([\\d\\.,]+)[ ]{0,1}([a-zA-Z]*)");

Split string to digits and alphabets in c#

2 Answers2