Regex to get NUMBER only from String

Question

I recieve "7+" or "5+" or "+5" from XML and wants to extract only the number from string using Regex. e.g Regex.Match() function

        stringThatHaveCharacters = stringThatHaveCharacters.Trim();
        Match m = Regex.Match(stringThatHaveCharacters, "WHAT I USE HERE");
        int number = Convert.ToInt32(m.Value);
        return number;

bluetoft · Accepted Answer · 2012-06-22 17:27:05Z

158

The answers above are great. If you are in need of parsing all numbers out of a string that are nonconsecutive then the following may be of some help:

string input = "1-205-330-2342";
string result = Regex.Replace(input, @"[^\d]", "");
Console.WriteLine(result); // >> 12053302342

answered Jun 22, 2012 at 17:27

bluetoft

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1 Comment

TNT Over a year ago

Regex.Replace(input, @"\D", "");

Kobi · Accepted Answer · 2011-01-25 10:17:46Z

93

\d+

\d represents any digit, + for one or more. If you want to catch negative numbers as well you can use -?\d+.

Note that as a string, it should be represented in C# as "\\d+", or @"\d+"

answered Jan 25, 2011 at 10:17

Kobi

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Comments

Joey · Accepted Answer · 2011-01-25 10:17:56Z

6

Either [0-9] or \d¹ should suffice if you only need a single digit. Append + if you need more.

1 The semantics are slightly different as \d potentially matches any decimal digit in any script out there that uses decimal digits.

answered Jan 25, 2011 at 10:17

Joey

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4 Comments

Muhammad Adnan Over a year ago

please define exact regex to use in Regex.Match function.... Because i m not good in Regex (SYNTAX)

Kobi Over a year ago

For a single digit you don't need a regex: char digit = s.First(Char.IsDigit);. I'd add that to my answer, but I don't think that's the case here.

Joey Over a year ago

@Kobi: That would still need explicit iteration over the string, though. Most people opting to use regex wouldn't want to do this :-)

Nabil Akhlaque Over a year ago

@MuhammadAdnan, var newInput = Regex.Replace(input, @"[^\d]", "");

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