String extension method which returns the substring between two given strings. - CSharp System

CSharp examples for System:String SubString

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Description

String extension method which returns the substring between two given strings.

Demo Code


using System.Text.RegularExpressions;
using System.Text;
using System.Security.Cryptography;
using System.Linq;
using System.Globalization;
using System.Collections.Generic;
using System;//ww w.j a v a2  s. co  m

public class Main{
        /// <summary>
        /// String extension method which returns the substring between two given strings. 
        /// </summary>
        /// <param name="input">The string on which the method is invoked.</param>
        /// <param name="startString">Start of the substring.</param>
        /// <param name="endString">End of the substring.</param>
        /// <param name="startFrom">Index to start search from (optional).</param>
        /// <returns>Returns the substring between startString and endString. If the substrings are not cointained in the input string - returns an empty string.</returns>
        public static string GetStringBetween(this string input, string startString, string endString, int startFrom = 0)
        {
            input = input.Substring(startFrom);
            startFrom = 0;
            if (!input.Contains(startString) || !input.Contains(endString))
            {
                return string.Empty;
            }

            var startPosition = input.IndexOf(startString, startFrom, StringComparison.Ordinal) + startString.Length;
            if (startPosition == -1)
            {
                return string.Empty;
            }

            var endPosition = input.IndexOf(endString, startPosition, StringComparison.Ordinal);
            if (endPosition == -1)
            {
                return string.Empty;
            }

            return input.Substring(startPosition, endPosition - startPosition);
        }
}

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