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Is... string? Numeric?

/** Made by Lonami Exo * (C) LonamiWebs 2015 * 22-02-2015 18:50 */ /// <summary> /// A class for determining whether something is or not with the maximum performance /// </summary> public static class Is { #region Consts const int LowerCaseStart = 97; const int LowerCaseEnd = 122; const int UpperCaseStart = 65; const int UpperCaseEnd = 90; const int AccentsStart = 192; const int AccentsEnd = 255; const int NumericStart = 48; const int NumericEnd = 57; #endregion #region Is Alpha /// <summary> /// Checks whether a text is or not alpha /// </summary> /// <param name="text">The text to check</param> /// <returns>True if it has only alpha characters</returns> public static bool Alpha(string text) { foreach (var c in text) { if (!Alpha(c)) return false; } return true; } /// <summary> /// Checks whether a character is or not alpha /// </summary> /// <param name="c">The character to check</param> /// <returns>True if it is alpha</returns> public static bool Alpha(char c) { int val = (int)c; return (val >= LowerCaseStart && val <= LowerCaseEnd) || (val >= UpperCaseStart && val <= UpperCaseEnd) || (val >= AccentsStart && val <= AccentsEnd); } #endregion #region Is Non Alpha /// <summary> /// Checks whether a text isn't or is alpha. /// Please consider using this instead of !Is.Alpha(...) /// </summary> /// <param name="text">The text to check</param> /// <returns>True if it has only non-alpha characters</returns> public static bool NonAlpha(string text) { foreach (var c in text) if (Alpha(c)) return false; return true; } #endregion #region Is Numeric /// <summary> /// Checks whether a text is or not numeric /// </summary> /// <param name="text">The text to check</param> /// <returns>True if it's numeric</returns> public static bool Numeric(string text) { foreach (var c in text) { if (!Numeric(c)) return false; } return true; } /// <summary> /// Checks whether a character is or not numeric /// </summary> /// <param name="c">The character to check</param> /// <returns>True if it's numeric</returns> public static bool Numeric(char c) { int val = (int)c; return (val >= NumericStart && val <= NumericEnd); } #endregion #region Is Non Numeric /// <summary> /// Checks whether a text isn't or is numeric. /// Please consider using this instead of !Is.Numeric(...) /// </summary> /// <param name="text">The text to check</param> /// <returns>True if it's not numeric</returns> public static bool NonNumeric(string text) { foreach (var c in text) if (Numeric(c)) return false; return true; } #endregion }
This class works quite faster than Regex to determine whether a string is ONLY alpha or not, and to check if a string is ONLY numeric or not (doesn't work for numbers with decimals)

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