C # Regular Expression match string

A regular expression can quickly determine whether a given string is a specified format. Here, some common methods are encapsulated into a string tool class.

1  Public Static classStringtool2 {3     /// <summary>4     ///determine if a string is a pure number5     /// </summary>6     /// <param name= "str" ></param>7     /// <returns></returns>8      Public Static BOOLIsnumber (stringstr)9     {Ten         returnRegex.IsMatch (str,@"^[0-9]+$"); One     } A  -     /// <summary> -     ///determine if a string is a pure letter the     /// </summary> -     /// <param name= "str" ></param> -     /// <returns></returns> -      Public Static BOOLIsletter (stringstr) +     { -         returnRegex.IsMatch (str,@"^[a-za-z]+$"); +     } A  at     /// <summary> -     ///determine whether a string is a combination of letters or numbers -     /// </summary> -     /// <param name= "str" ></param> -     /// <returns></returns> -      Public Static BOOLIsletterornumber (stringstr) in     { -         returnRegex.IsMatch (str,@"(? i) ^[0-9a-z]+$"); to     } +  -     /// <summary> the     ///number of Chinese characters in the statistics string *     /// </summary> $     /// <param name= "str" ></param>Panax Notoginseng     /// <returns></returns> -      Public Static intCountchinese (stringstr) the     { +         returnStr. Count (c = Regex.IsMatch (c.tostring),@"^[\u4e00-\u9fa5]{0,}$")); A     } the  +     /// <summary> -     ///determine if a string is plain Chinese $     /// </summary> $     /// <param name= "str" ></param> -     /// <returns></returns> -      Public Static BOOLIschinese (stringstr) the     { -         returnRegex.IsMatch (str,@"^[\u4e00-\u9fa5],{0,}$");Wuyi     } the  -     /// <summary> Wu     ///determines whether the string contains Chinese -     /// </summary> About     /// <param name= "str" ></param> $     /// <returns></returns> -      Public Static BOOLHaschinese (stringstr) -     { -         returnRegex.IsMatch (str,@"[\u4e00-\u9fa5]"); A     } +  the     /// <summary> -     ///number of full-width characters in the statistics string $     /// </summary> the     /// <param name= "str" ></param> the     /// <returns></returns> the      Public Static intCountsbccase (stringstr) the     { -         returnEncoding.Default.GetByteCount (str)-Str. Length; in     } the  the     /// <summary> About     ///determines whether the string contains full-width characters the     /// </summary> the     /// <param name= "str" ></param> the     /// <returns></returns> +      Public Static BOOLHassbccase (stringstr) -     { the         returnCountsbccase (str) >0;Bayi     } the  the     /// <summary> -     ///number of half-width characters in the statistics string -     /// </summary> the     /// <param name= "str" ></param> the     /// <returns></returns> the      Public Static intCountdbccase (stringstr) the     { -         returnStr. Length-countsbccase (str); the     } the  the     /// <summary>94     ///determines whether the string contains half-width characters the     /// </summary> the     /// <param name= "str" ></param> the     /// <returns></returns>98      Public Static BOOLHasdbccase (stringstr) About     { -         returnCountdbccase (str) >0;101     }102 103     /// <summary>104     ///determine if a string is compliant with the mailbox format the     /// </summary>106     /// <param name= "str" ></param>107     /// <returns></returns>108      Public Static BOOLIsemail (stringstr)109     { the         returnRegex.IsMatch (str,@"^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$");111     } the}

C # Regular Expression match string