Detailed explanation of C# data verification Regex example

Regular Expression, abbreviatedRegex,It is a powerful tool for matching and processing text. It can be used to search, replace or extract specific content in a string by defining a specific pattern.

Introduce namespace first

using ;

Intege(integer)

Must be a positive integer

        // Must be a positive integer        public static bool IsPositiveInteger(string txt)
        {
            Regex objReg = new Regex(@"^[1-9]\d*$");
            return (txt);
        }

Positive integers and zeros

 
        public static bool IsPositiveIntegerAndZero(string txt)
        {
            Regex objReg = new Regex(@"^[1-9]\d*|0$");
            return (txt);
        }

Negative integers

 
        public static bool IsNegativeInteger(string txt)
        {
            Regex objReg = new Regex(@"^-[1-9]\d*$");
            return (txt);
        }

Both positive and negative

 
        public static bool IsInteger(string txt)
        {
            Regex objReg = new Regex(@"^-?[1-9]\d*$");
            return (txt);
        }

Decimal(decimal)

Positive number

 
        public static bool IsPositiveDecimal(string txt)
        {
            Regex objReg = new Regex(@"^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$");
            return (txt);
        }

negative number

 
        public static bool IsNegativeDecimal(string txt)
        {
            Regex objReg = new Regex(@"^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$");
            return (txt);
        }

Both positive and negative

 
        public static bool IsDecimal(string txt)
        {
            Regex objReg = new Regex(@"^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$");
            return (txt);
        }

Other verifications

Mail

 
        public static bool IsEmail(string txt)
        {
            Regex objReg = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
            return (txt);
        }

ID card

 
        public static bool IsIdentityCard(string txt)
        {
            Regex objReg = new Regex(@"^(\d{15}$|^\d{18}$|^\d{17}(\d|X|x))$");
            return (txt);
        }

Email Code

   public static bool IsPostalCode(string txt)
        {
            if ( != 6) return false;
            Regex objReg = new Regex(@"[1-9]\d{5}(?!\d)");
            return (txt);
        }

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