CODEWITHSUNDEEP
c#.netregex
Jonathan Wood
Jonathan Wood

Reputation: 67355

Can Regex Extract Multiple Numbers from String?

Let's say I have a string like:

SORT_123_456

Is there an easy way to parse the two integer values? I do not know how many digits these values will have. It would also be helpful if I could validate the other characters and just abandon the parsing if they don't appear as I have them above (that would indicate something is wrong).

I know I can parse character by character, but I was wondering if Regex could handle this.

I just haven't really used regular expressions. Can someone tell me if this can be done more easily using Regex?

Upvotes: 1

Views: 1463

Answers (3)

Nicholas Carey
Nicholas Carey

Reputation: 74385

This is the simple way. One simple regular expression. It validates the source string and extracts and captures all the the numeric fields, regardless of number of such fields found:

string src = @"SORT_123_456_789" ;
Regex  rx = new Regex( @"^SORT(_\d+)*$" ) ;
Match  match = rx.Match( src ) ;

if ( !match.Success ) throw new InvalidOperationException() ;

int[] values = null ;
if ( match.Success )
{
  values = match
          .Groups[1]
          .Captures
          .Cast<Capture>()
          .Select( c => int.Parse( c.Value.Substring(1) ) )
          .ToArray()
          ;
}

Upvotes: 1

MethodMan
MethodMan

Reputation: 18863

If you want an example using the Split() Function here is what you could do

var splitStr = "SORT_123_456";
var sortable = splitStr.Split('_');
if (sortable[0].Contains("SORT"))
{
    //do your sorting logic because you have a sortable 
    sortable[1] //will be "123"
    sortable[2] //will be "456"
}

or you could check for string.Empty

var splitStr = "SORT_123_456";
var sortable = splitStr.Split('_');
if (!sortable[0] == string.Empty)
{
    //do your sorting logic because you have a sortable 
    sortable[1] //will be "123"
    sortable[2] //will be "456"
}

Upvotes: 2

user3398633
user3398633

Reputation:

SORT_(\d+)_(\d+) will do it. Just extract the two groups after using your regex.

If SORT is remplaced by an other word, then \w+_(\d+)_(\d+) will do it, if it is totally missing, (\d+)_(\d+) will be the regex, and finally, if the word must be in Caps : [A-Z]+_(\d+)_(\d+).

Upvotes: 6

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