String Extension Methods

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ValcourFiction.Utilities
{
    /// <summary>
    /// Where all string extension methods are stored
    /// </summary>
    public static class StringExtension
    {
        #region Public Extension Methods
        /// <summary>
        /// Advanced seperator function for seperating strings by the given chars into an array (accessable)
        /// </summary>
        /// <param name="sep">The chars to seperate with (defaults to space only)</param>
        /// <param name="septk">The chars to seperate and to add to the result (defaults to empty string)</param>
        /// <returns>The delimited string array</returns>
        public static string[] Delimit(this string str, string sep = " ", string septk = "")
        {
            List<string> ret = new List<string>();

            string tok = "";
            for (int i = 0; i < str.Length; i++)
            {
                if (sep.Contains(str[i]))
                {
                    ret.Add(tok);
                    tok = "";
                }
                else if (septk.Contains(str[i]))
                {
                    ret.Add(str[i].ToString());
                    ret.Add(tok);
                    tok = "";
                }
                else
                {
                    tok += str[i];
                }
            }

            return ret.ToArray();
        }

        /// <summary>
        /// Advanced combinator function for combining a string array into a single string.
        /// </summary>
        /// <param name="sep">The seperator character</param>
        /// <returns>The string array concatanated</returns>
        public static string Combine(this string[] str, string sep = " ")
        {
            string ret = "";
            for (int i = 0; i < str.Length; i ++)
            {
                ret += str[i];
                if (i < str.Length - 1)
                {
                    ret += sep;
                }
            }
            return ret;
        }

        /// <summary>
        /// Does the string contain the given char?
        /// </summary>
        /// <param name="c">The char to check for</param>
        /// <returns>If the char was found</returns>
        public static bool Contains(this string str, char c)
        {
            for (int i = 0; i < str.Length; i++)
            {
                if (str[i] == c)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Trim a string array of all strings in the given array (accessable)
        /// </summary>
        /// <param name="look4">The strings to trim</param>
        /// <returns>The trimmed string array</returns>
        public static string[] Trim(this string[] raw, string[] look4)
        {
            List<string> ret = raw.ToList<String>();

            for (int i = 0; i < ret.Count; i++)
            {
                if (look4.Contains(ret[i]))
                {
                    ret.RemoveAt(i);
                    i--;
                }
            }

            return ret.ToArray();
        }

        /// <summary>
        /// Does the given string array contain the given string? (accessable)
        /// </summary>
        /// <param name="str">The string to check for</param>
        /// <returns>If raw contains str</returns>
        public static bool Contains(this string[] raw, string str)
        {
            for (int i = 0; i < raw.Length; i++)
            {
                if (raw[i] == str)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// Does the given string array contain the given string array of indices in order? (accessable)
        /// </summary>
        /// <param name="dat">The string array to check for</param>
        /// <returns>If raw contains dat</returns>
        public static bool Contains(this string[] raw, string[] dat)
        {
            for (int i = 0; i < raw.Length - dat.Length; i++)
            {
                for (int inner = i; inner < i + dat.Length; inner++)
                {
                    if (raw[inner] != dat[inner])
                    {
                        break;
                    }
                    else if (inner == i + dat.Length - 1)
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        /// <summary>
        /// Gets the index of the first occurance of the given string in the given array (-1 if not found) (accessable)
        /// </summary>
        /// <param name="str">The given string</param>
        /// <returns>The index if it is found, -1 otherwise</returns>
        public static int IndexOf(this string[] raw, string str)
        {
            for (int i = 0; i < raw.Length; i++)
            {
                if (raw[i] == str)
                {
                    return i;
                }
            }

            return -1;
        }

        /// <summary>
        /// Gets the index of the first occurance of the given string array in the given string array (-1 if not found) (accessable)
        /// </summary>
        /// <param name="dat">The array to check for</param>
        /// <returns>The first index found, or -1 if not found</returns>
        public static int IndexOf(this string[] raw, string[] dat)
        {
            for (int i = 0; i < raw.Length - dat.Length; i++)
            {
                for (int inner = i; inner < i + dat.Length; inner++)
                {
                    if (raw[inner] != dat[inner])
                    {
                        break;
                    }
                    else if (inner == i + dat.Length - 1)
                    {
                        return i;
                    }
                }
            }
            return -1;
        }

        /// <summary>
        /// Gets the indices of the given string array where the given string is found (accessable)
        /// </summary>
        /// <param name="str">The string to check for</param>
        /// <returns>The resulting indices</returns>
        public static int[] IndicesOf(this string[] raw, string str)
        {
            List<int> ret = new List<int>();
            for (int i = 0; i < raw.Length; i++)
            {
                if (raw[i] == str)
                {
                    ret.Add(i);
                }
            }
            return ret.ToArray();
        }

        /// <summary>
        /// Gets the indices of the given string array where the given string array is found in order (accessable)
        /// </summary>
        /// <param name="dat">The array to check for</param>
        /// <returns>The resulting indices</returns>
        public static int[] IndicesOf(this string[] raw, string[] dat)
        {
            List<int> ret = new List<int>();
            for (int i = 0; i < raw.Length - dat.Length; i++)
            {
                for (int inner = i; inner < i + dat.Length; inner++)
                {
                    if (raw[inner] != dat[inner])
                    {
                        break;
                    }
                    else if (inner == i + dat.Length - 1)
                    {
                        ret.Add(i);
                    }
                }
            }
            return ret.ToArray();
        }
        #endregion
    }
}