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Categories / C# / Regular Expressions

 

Extracts all numbers from the string with regular expression

//------------------------------------------------------------------------------ // Copyright (c) 2003-2009 Whidsoft Corporation. All Rights Reserved. //------------------------------------------------------------------------------ namespace Whidsoft.WebControls {     using System;     using System.Drawing;     using System.IO;     using System.Collections;     using System.Web.UI;     using System.Web.UI.HtmlControls;     using System.Web.UI.WebControls;     using System.Text.RegularExpressions;     /// <summary>     ///  Utility class with various useful static functions.     /// </summary>     internal class Util     {         /// <summary>         /// Given a string that contains a number, extracts the substring containing the number.         /// Returns only the first number.         /// Example: "5px" returns "5"         /// </summary>         /// <param name="str">The string containing the number.</param>         /// <returns>The extracted number or String.Empty.</returns>         internal static string ExtractNumberString(string str)         {             string[] strings = ExtractNumberStrings(str);             if (strings.Length > 0)             {                 return strings[0];             }             return String.Empty;         }         /// <summary>         /// Extracts all numbers from the string.         /// </summary>         /// <param name="str">The string containing numbers.</param>         /// <returns>An array of the numbers as strings.</returns>         internal static string[] ExtractNumberStrings(string str)         {             if (str == null)             {                 return new string[0];             }             // Match the digits             MatchCollection matches = Regex.Matches(str, "(\\d+)", RegexOptions.IgnoreCase | RegexOptions.Singleline);             // Move to a string array             string[] strings = new string[matches.Count];             int index = 0;             foreach (Match match in matches)             {                 if (match.Success)                 {                     strings[index] = match.Value;                 }                 else                 {                     strings[index] = String.Empty;                 }                 index++;             }             return strings;         }     } }