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I saw an article on validating a date in pure HTML, the author had written such complex javascript when a regular expression would work fine.
So I thought I`d post some ones I`ve written and find very handy.
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This validates UK dates in the format; dd/mm/yy,
dd/mm/yyyy, dd.mm.yy, dd.mm.yyyy (remember .`s should be replaced with /`s before going to a database). It also checks the number of days in each month and leap years. So 29/02/1983 would be invalid, 29/02/1984 would be valid.
^(? ?:31(\\/|-|\\.)(?:0?[13578]|1[02]))\\1|(??:29|30)(\\/|-|\\.)(?:0?[1,3-9]|1[0-2])\\2))(??:1[6-9]|[2-9]\\d)?\\d{4})$|^(?:29(\\/|-|\\.)0?2\\3(???:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(??:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.|\\\\)(??:0?[1-9])|(?:1[0-2]))\\4(??:1[6-9]|[2-9]\\d)?\\d{4})$
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This validates the same as above, only it also checks for a valid time after the date.
So 12/2/2003 11:30,
12/2/2003 11.30,
12.2.2003 23.30,
12/2/2003 11.30pm,
etc, etc.
^((((31(\\/|-|\\.|\\\\)(0?[13578]|1[02]))|((29|30)(\\/|-|\\.|\\\\)(0?[1,3-9]|1[0-2])))(\\/|-|\\.|\\\\)(1[6-9]|[2-9]\\d)?\\d{2})|(29(\\/|-|\\.|\\\\)0?2(\\/|-|\\.|\\\\)(((1[6-9]|[2-9]\\d)?(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))|(0?[1-9]|1\\d|2[0-8])(\\/|-|\\.|\\\\)((0?[1-9])|(1[0-2]))(\\/|-|\\.|\\\\)((1[6-9]|[2-9]\\d)?\\d{2})) ((([0]?[1-9]|1[0-2])( [0-5][0-9](([0-5][0-9])?( )?(AM|am|aM|Am|PM|pm|pM|Pm))|(([0]?[0-9]|1[0-9]|2[0-3])([0-5][0-9](([0-5][0-9])?))$
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This validates e-mail addresses, although it`s still best to actively test an e-mail address by sending an e-mail.
As people pointed out here in something I posted an old e-mail expression on (1; it failed a lot, haha, hence this new one.) and 2; there can be tld and ip based addresses.
But I`d like to think someone dealing with users within a TLD or using IP based e-mails would use real methods to test the e-mail, and not just a regular expression.
Anyway, I`m just the messenger =8-)
^([a-zA-Z0-9_\-])+(\.([a-zA-Z0-9_\-])+)*@((\[(((([0-1])?([0-9])?[0-9])|(2[0-4][0-9])|(2[0-5][0-5])))\.(((([0-1])?([0-9])?[0-9])|(2[0-4][0-9])|(2[0-5][0-5])))\.(((([0-1])?([0-9])?[0-9])|(2[0-4][0-9])|(2[0-5][0-5])))\.(((([0-1])?([0-9])?[0-9])|(2[0-4][0-9])|(2[0-5][0-5]))\]))|((([a-zA-Z0-9])+(([\-])+([a-zA-Z0-9])+)*\.)+([a-zA-Z])+(([\-])+([a-zA-Z0-9])+)*))$
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Cheers,
James
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Codetoad guys; you really should have an options to dissable emoticons.
Here again...
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DATE
^ ( ?: ( ?:31 ( \\/|-|\\. ) ( ?:0?[13578]|1[02] ) ) \\1| ( ?: ( ?:29|30 ) ( \\/|-|\\. ) ( ?:0?[1,3-9]|1[0-2] ) \\2 ) ) ( ?: ( ?:1[6-9]|[2-9]\\d ) ?\\d{4} ) $|^ ( ?:29 ( \\/|-|\\. ) 0?2\\3 ( ?: ( ?: ( ?:1[6-9]|[2-9]\\d ) ? ( ?:0[48]|[2468][048]|[13579][26] ) | ( ?: ( ?:16|[2468][048]|[3579][26] ) 00 ) ) ) ) $|^ ( ?:0?[1-9]|1\\d|2[0-8] ) ( \\/|-|\\.|\\\\ ) ( ?: ( ?:0?[1-9] ) | ( ?:1[0-2] ) ) \\4 ( ?: ( ?:1[6-9]|[2-9]\\d ) ?\\d{4} ) $
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DATE & TIME
^ ( ( ( ( 31 ( \\/|-|\\.|\\\\ ) ( 0?[13578]|1[02] ) ) | ( ( 29|30 ) ( \\/|-|\\.|\\\\ ) ( 0?[1,3-9]|1[0-2] ) ) ) ( \\/|-|\\.|\\\\ ) ( 1[6-9]|[2-9]\\d ) ?\\d{2} ) | ( 29 ( \\/|-|\\.|\\\\ ) 0?2 ( \\/|-|\\.|\\\\ ) ( ( ( 1[6-9]|[2-9]\\d ) ? ( 0[48]|[2468][048]|[13579][26] ) | ( ( 16|[2468][048]|[3579][26] ) 00 ) ) ) ) | ( 0?[1-9]|1\\d|2[0-8] ) ( \\/|-|\\.|\\\\ ) ( ( 0?[1-9] ) | ( 1[0-2] ) ) ( \\/|-|\\.|\\\\ ) ( ( 1[6-9]|[2-9]\\d ) ?\\d{2} ) ) ( ( ( [0]?[1-9]|1[0-2] ) ( : ) [0-5][0-9] ( ( : ) [0-5][0-9] ) ? ( ) ? ( AM|am|aM|Am|PM|pm|pM|Pm ) ) | ( ( [0]?[0-9]|1[0-9]|2[0-3] ) ( : ) [0-5][0-9] ( ( : ) [0-5][0-9] ) ? ) ) $
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EMAIL
^ ( [a-zA-Z0-9_\-] ) + ( \. ( [a-zA-Z0-9_\-] ) + ) *@ ( ( \[ ( ( ( ( [0-1] ) ? ( [0-9] ) ?[0-9] ) | ( 2[0-4][0-9] ) | ( 2[0-5][0-5] ) ) ) \. ( ( ( ( [0-1] ) ? ( [0-9] ) ?[0-9] ) | ( 2[0-4][0-9] ) | ( 2[0-5][0-5] ) ) ) \. ( ( ( ( [0-1] ) ? ( [0-9] ) ?[0-9] ) | ( 2[0-4][0-9] ) | ( 2[0-5][0-5] ) ) ) \. ( ( ( ( [0-1] ) ? ( [0-9] ) ?[0-9] ) | ( 2[0-4][0-9] ) | ( 2[0-5][0-5] ) ) \] ) ) | ( ( ( [a-zA-Z0-9] ) + ( ( [\-] ) + ( [a-zA-Z0-9] ) + ) *\. ) + ( [a-zA-Z] ) + ( ( [\-] ) + ( [a-zA-Z0-9] ) + ) * ) ) $
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Archive Import (James Laugesen) 
