How do I extract substrings from string?

Question

I have so expression that contains numbers and plus symbols:

string expression = 235+356+345+24+5+2+4355+456+365+356.....+34+5542;
List<string>  numbersList = new List<string>();

How should I extract every number substring (235, 356, 345, 24....) from that expression and collect them into a string list?

check out string.split msdn.microsoft.com/en-us/library/system.string.split.aspx — cadrell0
– cadrell0, Commented Aug 17, 2012 at 18:29

Eric J. · Accepted Answer · 2012-08-17 18:30:00Z

4

You can do something like

List<string> parts = expression.Split('+').ToList();

http://msdn.microsoft.com/en-us/library/system.string.split.aspx

If there is any potential for white space around the + signs, you could so something a little more fancy:

List<string> parts = (from t in expression.Split('+') select t.Trim()).ToList();

answered Aug 17, 2012 at 18:30

Eric J.

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kprobst · Accepted Answer · 2012-08-17 18:31:52Z

3

Something like:

string expression = "235+356+345+24+5+2+4355+456+365+356";
List<string> list = new List<string>(expression.Split('+'));

answered Aug 17, 2012 at 18:31

kprobst

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Comments

Pilgerstorfer Franz · Accepted Answer · 2012-08-17 18:32:24Z

1

Try this piece of code

string expression = "235+356+345+24+5+2+4355+456+365+356";
string[] numbers = expression.Split('+');
List<string> numbersList = numbers.ToList();

answered Aug 17, 2012 at 18:32

Pilgerstorfer Franz

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2 Comments

Eric J. Over a year ago

You don't need the new char[] { '+' }. Just '+' works fine and is more compact.

Eric J. Over a year ago

Works because it's defined as a params parameter.

Nicholas Carey · Accepted Answer · 2012-08-17 19:36:59Z

1

Or this, a positive check for numeric sequences:

private static Regex rxNumber = new Regex( "\d+" ) ;
public IEnumerable<string> ParseIntegersFromString( string s )
{
    Match m = rxNumber.Match(s) ;
    for ( m = rxNumber.Match(s) ; m.Success ) ; m = m.NextMatch() )
    {
        yield return m.Value ;
    }
}

answered Aug 17, 2012 at 19:36

Nicholas Carey

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