Find and extract a number from a string

c# .net regex string
van picture van · Jan 19, 2011 · Viewed 572.7k times · Source

I have a requirement to find and extract a number contained within a string.

For example, from these strings:

string test = "1 test"
string test1 = " 1 test"
string test2 = "test 99"

How can I do this?

Answer

Tim Pietzcker picture Tim Pietzcker · Jan 19, 2011

\d+ is the regex for an integer number. So 

//System.Text.RegularExpressions.Regex
resultString = Regex.Match(subjectString, @"\d+").Value;

returns a string containing the first occurrence of a number in subjectString.

Int32.Parse(resultString) will then give you the number.

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