Returns true when "search For" starts a position "pos" within "search In" and increments "pos" by the length of search For. - CSharp System

CSharp examples for System:String Start End

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Description

Returns true when "search For" starts a position "pos" within "search In" and increments "pos" by the length of search For.

Demo Code

// file, You can obtain one at http://www.apache.org/licenses/
using System.Text.RegularExpressions;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;//from   w  w w  .  j  a  v a2 s  .  co  m

public class Main{
        /// <summary>
		/// Returns true when "searchFor" starts a position "pos" within
		/// "searchIn" and increments "pos" by the length of searchFor.  If
		/// searchFor does not exist, "pos" will be untouched.
		/// </summary>
		/// <param name="searchFor"></param>
		/// <param name="searchIn"></param>
		/// <param name="pos"></param>
		/// <returns></returns>
		public static bool LookAhead(this string searchIn, string searchFor, ref int pos) {
			if (searchFor.Length + pos >= searchIn.Length) {
				return false;
			}
			for (var i = 0; i < searchFor.Length; i++) {
				if (searchFor[i] != searchIn[i + pos]) {
					return false;
				}
			}
			pos += searchFor.Length;
			return true;
		}
}

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