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.NET Forum / ASP.NET / General / March 2008Regex help
I'm trying to add a regex validator to a webform textbox to validate time format. The field is optional, so I'm trying to get a regex which will validate empty, or the format [00-23]:[00-59] Is anyone here good with regular expressions and can point me to a pattern that will do the above? > I'm trying to add a regex validator to a webform textbox to validate time > format. The field is optional, so I'm trying to get a regex which will > validate empty, or the format > [00-23]:[00-59] > Is anyone here good with regular expressions and can point me to a pattern > that will do the above? try \[\d\d-\d\d\]:\[\d\d-\d\d\] > \[\d\d-\d\d\]:\[\d\d-\d\d\] Hmm, won't that show 99:99 as valid, and an empty string as invalid? > > \[\d\d-\d\d\]:\[\d\d-\d\d\] > > Hmm, won't that show 99:99 as valid, you're right, but then you should extend your validation expression e.g. \[[0|1|2][0|1|2|3]-[0|1|2][0|1|2|3]]...... to match [00-01]..., [22-23]... but not [24-25]..., etc > and an empty string as invalid? RegularExpressionValidator won't fire when input is empty. When you want to disallow an empty string, you should add the RequiredFieldValidator Control. > you're right, but then you should extend your validation expression Yes, I think I've compressed my original one down now: ([0-1][0-9]|2[0-3]):([0-5][0-9]) Does that look right? > RegularExpressionValidator won't fire when input is empty True, I forgot about that. Thanks for your help > > you're right, but then you should extend your validation expression > > Yes, I think I've compressed my original one down now: > ([0-1][0-9]|2[0-3]):([0-5][0-9]) > Does that look right? No. The logic is very simple. The brackets [] denote a number range. [0|1|2] indicates that we are looking for 0, 1, or 2 [0|1|2|3] indicates that we are looking for 0, 1, 2, or 3 so, [0|1|2][0|1|2|3] will validate 00, 01, 02 .. 23, but not 24, 25 etc. So, to validate "[00-23]:[00-59]" you would need something like the following string \[[0|1|2][0|1|2|3]-[0|1|2][0|1|2|3]\]:\[[0|1|2|3|4|5][0|1|2|3|4|5|6|7| 8|9]-[0|1|2|3|4|5][0|1|2|3|4|5|6|7|8|9]\] Hope this helps >> Yes, I think I've compressed my original one down now: >> ([0-1][0-9]|2[0-3]):([0-5][0-9]) [quoted text clipped - 12 lines] > \[[0|1|2][0|1|2|3]-[0|1|2][0|1|2|3]\]:\[[0|1|2|3|4|5][0|1|2|3|4|5|6|7| > 8|9]-[0|1|2|3|4|5][0|1|2|3|4|5|6|7|8|9]\] What's the difference between [0|1|2|3|4|5|6|7|8|9] and [0-9]? > >> Yes, I think I've compressed my original one down now: > >> ([0-1][0-9]|2[0-3]):([0-5][0-9]) [quoted text clipped - 16 lines] > > - Show quoted text - Hi Leon Sorry I think you're right and I did a mistake in my answer. The syntax for the regular-expression validation controls is a little bit different than on the server and so, it's always better to validate each expression using a validator control (I thought 0-9 will not work there). Please refer to http://msdn2.microsoft.com/en-us/library/ae5bf541.aspx. So, if you want to validate a regular 24hr time input string then you expression will work. Note, "[0-9]" equivalent to "\d" > Note, "[0-9]" equivalent to "\d" Good point, so it could be: ([0-1]\d|2[0-3]):([0-5]\d) Hello Alexey, >> "Alexey Smirnov" <alexey.smir...@gmail.com> wrote in message >> [quoted text clipped - 32 lines] > expression will work. > Note, "[0-9]" equivalent to "\d" As a side note: [0123456789] equals [0-9] but [0|1|2|3|4|5|6|7|8|9|0] equals [0-9|] you should not use the | within a range. Another note, the clientside and serverside validations are almost equal. A few specifics in substracting ranges from an existing group and look behinds are all that differentiate them. You can find the exact info on http://www.regular-expressions.info/refflavors.html -- Jesse Houwing jesse.houwing at sogeti.nl > I'm trying to add a regex validator to a webform textbox to validate time > format. The field is optional, so I'm trying to get a regex which will > validate empty, or the format > [00-23]:[00-59] > Is anyone here good with regular expressions and can point me to a pattern > that will do the above? Oh wait, I think I've got it. Would: (0[0-9]|1[0-9]|2[0-3]):(0[0-9]|[0-5][0-9]) Work?
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