/// <summary>
/// Returns a new string with all occurrences of a specified substring replaced
/// </summary>
/// <param name="str"></param>
/// <param name="oldValue">The string to be replaced</param>
/// <param name="newValue">The string to replace all occurances of oldValue</param>
/// <param name="comparisonType">One of the enumeration values that specifies the rules for the search</param>
/// <returns></returns>
public static string Replace(this string str, string oldValue, string newValue, StringComparison comparisonType = UseCase)
{
if (oldValue.In(new string[] { "\\" }))
{
return(str.Replace(oldValue, newValue));
}
return(Regex.Replace(str, Regex.Escape(oldValue), newValue, comparisonType.ToRegEx()));
}
/// <summary>
/// Checks if a string matches pattern
/// </summary>
/// <param name="str"></param>
/// <param name="patternValue">The pattern to compare: *=any characters, ?=a character, #=a digit, etc.</param>
/// <param name="comparisonType">One of the enumeration values that specifies the rules for the search</param>
/// <returns></returns>
public static bool Like(this string str, string patternValue, StringComparison comparisonType = UseCase)
{
int Index = 0;
string Ch = "";
string regexPattern = "";
// Escape parens
patternValue = patternValue.Replace("(", @"\(");
patternValue = patternValue.Replace(")", @"\)");
// Convert Pattern from a like operand to a regular expression
while (Index < patternValue.Length)
{
Ch = patternValue.Substring(Index, 1);
// Ignore escaped literals
if (Ch == "[")
{
while (Ch != "]" & Index <= patternValue.Length)
{
regexPattern += Ch;
Index += 1;
Ch = patternValue.Substring(Index, 1);
}
}
// Convert wildcards
switch (Ch)
{
case "*":
case "%":
regexPattern += "(.|\n)*";
break;
case "?":
case "_":
regexPattern += ".{1}";
break;
case "#":
regexPattern += "[\\d]+";
break;
default:
regexPattern += Ch;
break;
}
Index += 1;
}
// Convert character exclusion syntax
regexPattern = regexPattern.Replace("[!", "[^");
if (comparisonType.ToRegEx() == RegexOptions.IgnoreCase)
{
regexPattern = "(?i)" + regexPattern;
}
MatchCollection Matches = Regex.Matches(str, regexPattern, RegexOptions.Multiline & comparisonType.ToRegEx());
if (Matches.Count > 0)
{
return(Matches[0].Value.Equals(str, comparisonType));
}
return(false);
}
/// <summary>
/// Returns a value indicating whether a specified values occurs within this string.
/// </summary>
/// <param name="str"></param>
/// <param name="Value">Substring to search for</param>
/// <param name="comparisonType">One of the enumeration values that specifies the rules for the search</param>
/// <returns></returns>
public static bool Contains(this string str, string Value, StringComparison comparisonType = UseCase)
{
return(Regex.IsMatch(str, Regex.Escape(Value), comparisonType.ToRegEx()));
}
