| Title |
Test
Find
Pattern Title
|
| Expression |
(?'DateLiteral' (?# Per the VB Spec : DateLiteral ::= '#' [ Whitespace+ ] DateOrTime [ Whitespace+ ] '#' )
\#\s*
(?'DateOrTime' (?# DateOrTime ::= DateValue Whitespace+ TimeValue | DateValue | TimeValue )
(?'DateValue'
(?# DateValue ::= Whitespace+ TimeValue | DateValue | TimeValue )
(
(?# DateValue ::= MonthValue / DayValue / YearValue | MonthValue - DayValue - YearValue )
(?'Month'(0?[1-9])|1[0-2]) (?# Month 01 - 12 )
(?'Sep'[-/]) (?# Date separator '-' or '/' )
(?'Day'0?[1-9]|[12]\d|3[01]) (?# Day 01 - 31 )
\k'Sep' (?# whatever date separator was previously matched )
(?'Year'\d{1,4})
\s+
(?# TimeValue ::= HourValue : MinuteValue [ : SecondValue ] [ WhiteSpace+ ] [ AMPM ] )
(?'HourValue'(0?[1-9])|1[0-9]|2[0-4]) (?# Hour 01 - 24 )
[:]
(?'MinuteValue'0?[1-9]|[1-5]\d|60) (?# Minute 01 - 60 )
[:]
(?'SecondValue':0?[1-9]|[1-5]\d|60)? (?# Optional Minute :01 - :60 )
\s*
(?'AMPM'[AP]M)?
)
|
(
(?# DateValue ::= MonthValue / DayValue / YearValue | MonthValue - DayValue - YearValue )
(?'Month'(0?[1-9])|1[0-2]) (?# Month 01 - 12 )
(?'Sep'[-/]) (?# Date separator '-' or '/' )
(?'Day'0?[1-9]|[12]\d|3[01]) (?# Month 01 - 31 )
\k'Sep' (?# whatever date separator was previously matched )
(?'Year'\d{4})
)
|
(
(?# TimeValue ::= HourValue : MinuteValue [ : SecondValue ] [ WhiteSpace+ ] [ AMPM ] )
(?'HourValue'(0?[1-9])|1[0-9]|2[0-4]) (?# Hour 01 - 24 )
[:]
(?'MinuteValue'0?[1-9]|[1-5]\d|60) (?# Minute 01 - 60 )
[:]
(?'SecondValue':0?[1-9]|[1-5]\d|60)? (?# Optional Minute :01 - :60 )
\s*
(?'AMPM'[AP]M)?
)
)
)
\s*\#
) |
| Description |
Match the VB Language specification BNF for DateTime literal. http://msdn.microsoft.com/library/en-us/vbls7/html/vblrfvbspec2_4_6.asp?frame=true
DateLiteral ::= # [ Whitespace+ ] DateOrTime [ Whitespace+ ] #
DateOrTime ::=
DateValue Whitespace+ TimeValue |
DateValue |
TimeValue
DateValue ::=
MonthValue / DayValue / YearValue |
MonthValue – DayValue - YearValue
TimeValue ::=
HourValue : MinuteValue [ : SecondValue ] [ WhiteSpace+ ] [ AMPM ]
MonthValue ::= IntLiteral
DayValue ::= IntLiteral
YearValue ::= IntLiteral
HourValue ::= IntLiteral
MinuteValue ::= IntLiteral
SecondValue ::= IntLiteral
AMPM ::= AM | PM
|
| Matches |
# 8/23/1970 3:45:39AM # | # 8/23/1970 # |
| Non-Matches |
## | # 23/8/1970 # |
| Author |
Rating:
Darren Neimke
|
| Source |
|
| Your Rating |
|
Title: Ranges
Name: Michael Ash
Date: 3/30/2004 11:21:54 AM
Comment:
While this regex is a good format match the ranges it accepts are a little scewed. Most notablely the time which will accept 24:60:60 but not 4:00AM.
Title: re: Can compress some of the subexprs
Name: Michael Ash
Date: 3/30/2004 10:44:49 AM
Comment:
Actually (?'Day'0?[1-9]|[12]\d|3[01]) and (?'Day'[012]?\d|3[01]) are not exactlly the same. The latter will accept 0 and 00? which aren't valid for the expression
Title: Can compress some of the subexprs
Name: Eric
Date: 3/30/2004 9:32:43 AM
Comment:
One refinement... on the numeric parts (day/hour etc) you can combine some of the expressions:
(?'Day'0?[1-9]|[12]\d|3[01]) => (?'Day'[012]?\d|3[01])
since (in this case) only 3 needs to be special-cased; the subexpressions for 0 and for 1-2 were identical. The same thing can be done for hours, minutes, and seconds.
I don't know if it will make any difference performance wise (I suspect not), but it is a little more succinct.
Title: Thanks to the Regulator
Name: Darren Neimke
Date: 3/30/2004 7:28:06 AM
Comment:
I should mention that The Regulator was invaluable while building this expression:
http://royo.is-a-geek.com/iserializable/regulator/
The syntax coloring and the friendly display of Named Captures was very useful as I worked on the pattern. Thanks Royo! :-)
