public static string Substring(this string str, string startString, string endString, StringInclusionOptions stringInclusionOptions)
{
tryArgumentOutOfRangeException(str, startString, nameof(startString));
int startStringIndex = str.IndexOf(startString);
tryArgumentOutOfRangeException(str.Substring(startStringIndex + startString.Length), endString, nameof(endString));
int endStringIndex = str.IndexOf(endString, startStringIndex + startString.Length);
switch (stringInclusionOptions)
{
case StringInclusionOptions.IncludeNone:
startStringIndex += startString.Length;
break;
case StringInclusionOptions.IncludeStart:
break;
case StringInclusionOptions.IncludeEnd:
startStringIndex += startString.Length;
endStringIndex += endString.Length;
break;
case StringInclusionOptions.IncludeAll:
endStringIndex += endString.Length;
break;
}
int selectLength = endStringIndex - startStringIndex;
return(str.Substring(startStringIndex, selectLength));
}
public static string SubstringLast(this string str, string startString, string endString, StringInclusionOptions stringInclusionOptions = StringInclusionOptions.IncludeNone, StringComparison stringComparison = StringComparison.CurrentCulture)
{
Validator.CheckNullArgument(startString, nameof(startString));
Validator.CheckNullArgument(endString, nameof(endString));
Validator.CheckEndStringLastIndex(str, startString, endString, out int startStringIndex, out int endStringIndex, stringComparison);
// This logic is because of how the "endStringIndex" is being calculated.
switch (stringInclusionOptions)
{
case StringInclusionOptions.IncludeNone:
startStringIndex += startString.Length;
break;
case StringInclusionOptions.IncludeStart:
endStringIndex += startString.Length;
break;
case StringInclusionOptions.IncludeEnd:
startStringIndex += startString.Length;
endStringIndex += endString.Length;
break;
case StringInclusionOptions.IncludeAll:
endStringIndex += endString.Length + startString.Length;
break;
}
int selectLength = endStringIndex;
return(str.Substring(startStringIndex, selectLength));
}
/// <summary>
/// Retrieves a substring from this instance that is located between given start and end strings.
/// </summary>
/// <param name="str">The instance from which to extract a substring.</param>
/// <param name="startString">The string which marks the start of the substring to be extracted.</param>
/// <param name="endString">The string which marks the end of the substring.</param>
/// <param name="stringInclusionOptions">A StringInclusionOptions enum, indicating whether startString and/or endString should be included in the result.</param>
/// <returns>A string representing the part of the original string, located between the startString and endString.</returns>
public static string Substring(this string str, string startString, string endString, StringInclusionOptions stringInclusionOptions)
{
// These are precaution calls, meant to throw an "ArgumentOutOfRangeException" exception if needed.
str.Substring(str.IndexOf(startString));
str.Substring(str.IndexOf(endString));
int startStringIndex = str.IndexOf(startString);
int endStringIndex = str.IndexOf(endString);
switch (stringInclusionOptions)
{
case StringInclusionOptions.IncludeNone:
startStringIndex += startString.Length;
break;
case StringInclusionOptions.IncludeStart:
break;
case StringInclusionOptions.IncludeEnd:
startStringIndex += startString.Length;
endStringIndex += endString.Length;
break;
case StringInclusionOptions.IncludeAll:
endStringIndex += endString.Length;
break;
}
int selectLength = endStringIndex - startStringIndex;
return(str.Substring(startStringIndex, selectLength));
}
