C # method for judging the correct date format entered by regular expressions,

C # method for judging the correct date format entered by regular expressions,
This article will introduce an example code to explain how to use regular expressions to make C # determine whether the input date format is correct. I hope this code will help you.

Generally, when we use C # To Write System programs or Web development, we will encounter a situation where we need to verify whether the input string is a date, the following describes a very comprehensive method to verify a date using a regular expression:

C Regular Expression Date Code 1:

///

/// Whether it is a date string

///

///

Date string)

///

Public static bool IsDate (string StrSource)

{

Return Regex. IsMatch (StrSource, @ "^ (1 [6-9] | [2-9] \ d) \ d {2})-(0? [1, 13578] | 1 [02])-(0? [1-9] | [12] \ d | 3 [01]) | (1 [6-9] | [2-9] \ d) \ d {2})-(0? [13456789] | 1 [012])-(0? [1-9] | [12] \ d | 30) | (1 [6-9] | [2-9] \ d) \ d {2 }) -0? 2-(0? [1-9] | 1 \ d | 2 [0-9]) | (1 [6-9] | [2-9] \ d) (0 [48] | [2468] [048] | [13579] [26]) | (16 | [2468] [048] | [3579] [26]) 00)-0? 2-29-) $ ");

}

///

/// Whether it is a time string

///

///

Time string (15:00:00)

///

Public static bool IsTime (string StrSource)

{

Return Regex. IsMatch (StrSource, @ "^ (20 | 21 | 22 | 23 | [0-1]? \ D): [0-5]? \ D: [0-5]? \ D) $ ");

}

///

/// Whether it is a date + time string

///

///

///

Public static bool IsDateTime (string StrSource)

{

Return Regex. IsMatch (StrSource, @ "^ (1 [6-9] | [2-9] \ d) \ d {2})-(0? [1, 13578] | 1 [02])-(0? [1-9] | [12] \ d | 3 [01]) | (1 [6-9] | [2-9] \ d) \ d {2})-(0? [13456789] | 1 [012])-(0? [1-9] | [12] \ d | 30) | (1 [6-9] | [2-9] \ d) \ d {2 }) -0? 2-(0? [1-9] | 1 \ d | 2 [0-8]) | (1 [6-9] | [2-9] \ d) (0 [48] | [2468] [048] | [13579] [26]) | (16 | [2468] [048] | [3579] [26]) 00)-0? 2-29-) (20 | 21 | 22 | 23 | [0-1]? \ D): [0-5]? \ D: [0-5]? \ D) $ ");

}

C Regular Expression Date Code 2:

// Whether it is an integer

Public static bool IsInt (string StrSource)

{

Return Regex. IsMatch (StrSource, @ "^ [0-9] * $ ");

}

Public static bool IsDate (string strDate)

{

If (string. IsNullOrEmpty (strDate ))

Return false;

String s_reg = @ "^ (? Ni :(? = \ D )((? 'Year' (1 [6-9]) | ([2-9] \ d )(? 'Sept' [/.-]) (? 'Month' 0? [1-9] | 1 [012]) \ 2

(? 'Day '((? (0? [1-9] | 1 [012]) (: [0-5]? \ D) {0, 2} (\ x20 [AP] M) | ([01]?

\ D | 2 [0-3]) (: [0-5]? \ D) {1, 2 }))?) $ ";

Regex reg = new Regex (s_reg );

If (reg. IsMatch (strDate. ToLower ()))

Return true;

Else

Return false;

}

The above section describes how to use the C # regular expression to determine whether the input date format is correct. It is helpful for you to learn the c Regular Expression date judgment. At the same time, I would like to thank you for your constant support for our website.