Return Regex. The Unicode ranges are available on below link:ĪPI : public static bool IsAlphaNumeric(this string stringToTest)Ĭonst string numSet = string charSet = string numSet = string charSet = string numSet = string charSet = string numSet = Regex.Match(stringToTest, + numSet + + charSet + + charSet + + numSet + + charSet + numSet static bool IsNumeric(this string stringToTest)Ĭonst string numSet = string numSet = Regex.Match(stringToTest, + numSet + static bool IsAlpha(this string stringToTest) To validate that the value is not null or an empty. If the value of the property is null or an empty string (''), the value automatically passes validation for the RegularExpressionAttribute attribute. The Pattern property contains the regular expression. The charSet/numSet range for the desired language can be specified. The regular expression enables you to specify very precisely the format of valid values.
#Regular expression not alphanumeric how to#
IsNumeric - String should contain atleast 1 number (in the language numSet specified) and comprise only of numbers. This example will show you how to allow only alphanumeric characters in a string using a-zA-Z0-9 regular expression pattern and how to remove special characters.
Follow this answer to receive notifications. Usually such patterns are used by string-searching algorithms for 'find' or 'find and replace' operations on strings, or for input validation. the regular expression will be easier than this and. So you can modify your pattern as, pattern w+. A regular expression (shortened as regex or regexp also referred to as rational expression) is a sequence of characters that specifies a search pattern. Matches, if in the beginning of the string there is w (alphanumeric or underscore character) or.
IsAlpha - String should contain atleast 1 alpha (in the language charSet specified) and comprise only of alpha. Python has a special sequence w for matching alphanumeric and underscore when the LOCALE and UNICODE flags are not specified. Also, the string should comprise only of alpha and numbers. IsAlphaNumeric - String must contain atleast 1 alpha (letter in Unicode range, specified in charSet) and atleast 1 number (specified in numSet). Try these multi-lingual extensions I have made for string.