Find number in string

Question

How to find number(int, float) in a string (fast method)?
For example: "Question 1" and "Question 2.1". I need that in variable would be only number.
Thanks.

One of your questions is about regular expressions. theres your answer — skyfoot, Jul 27 '11 at 09:50
possible duplicate of [c# find and extract number from a string](http://stackoverflow.com/questions/4734116/c-find-and-extract-number-from-a-string) — , Jul 27 '11 at 09:53

Amir Ismail · Accepted Answer · 2011-07-27T10:23:00.710

3

you can use this ([0-9]\.*)*[0-9] regex to get it. you can test any regex here

Edit

this sample code in C#

Regex regexpattern = new Regex(@"(([0-9]\.*)*[0-9])");
String test = @"Question 1 and Question 2.1.3";
foreach (Match match in regexpattern.Matches(test))
{
    String language = match.Groups[1].Value;
}

edited Jul 27 '11 at 10:23

answered Jul 27 '11 at 09:50

Amir Ismail

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score 1 · Answer 2 · answered Jul 27 '11 at 09:51

1

You can use Reqular Expressions. To search numbers try this:

var r = System.Text.RegularExpressions.Regex.Match("Question 2.1", "\d+");

answered Jul 27 '11 at 09:51

Sergey Shulik

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This will return 1 and 2 but not 1.2 – skyfoot Jul 27 '11 at 09:54

score 1 · Answer 3 · answered Jul 27 '11 at 09:51

1

There's always the good ol' regular expressions! It wouldn't give you a float for "2.1" though, but I'm not sure that's a good idea since there's always the possibility of "2.1.4" or even "2a". Might be best to store a vector of numbers for each item.

answered Jul 27 '11 at 09:51

Skizz

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score 1 · Answer 4 · answered Jul 27 '11 at 09:52

1

Use this regex: \d+(?:\.\d+)?.

answered Jul 27 '11 at 09:52

Kirill Polishchuk

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Find number in string

4 Answers4