Sample code for C # common regular validation functions

This article mainly introduces C # common regular validation http://www.php.cn/wiki/145.html "target=" _blank "> function, an example of C # for IP authentication, price verification and positive integer verification of the relevant operational skills, A friend you need can refer to the following

The examples in this paper describe C # common regular validation functions. Share to everyone for your reference, as follows:

1. IP Address Verification

<summary>///IP Address authentication///</summary>public static bool Checkip (string IP) {  bool result = false;  Regex ipreg = new Regex (@ "^ (\d{1,2}|1\d\d|2[0-4]\d|25[0-5]) \. ( \D{1,2}|1\D\D|2[0-4]\D|25[0-5]) \.  (\d{1,2}|1\d\d|2[0-4]\d|25[0-5]) \. (\d{1,2}|1\d\d|2[0-4]\d|25[0-5]) $ ");  if (Ipreg.ismatch (IP))  {    result = true;  }  return result;}

2. Price verification

<summary>///Price Verification///</summary>///<param name= "Pricestr" ></param>///<returns> </returns>public bool Checkprice (string pricestr) {  bool result = false;  Regex regex = new Regex (@ "^\d+ (\.\d{1,2})? $", regexoptions.ignorecase);  Match match = regex. Match (PRICESTR);  if (match. Success)  {    result = true;  }  return result;}

3, positive integer verification

<summary>///positive integer validation//</summary>public static bool Checkpositiveinteger (string numstr) {  bool result = false;  Regex regex = new Regex (@ "^[1-9]\d*$", regexoptions.ignorecase);  Match match = regex. Match (NUMSTR);  if (match. Success)  {    result = true;  }  return result;}