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How to check if a string contains only digits in Java [duplicate]
In Java for String class there is a method called matches, how to use this method to check if my string is having only digits using regular expression. I tried with below examples, but both of them returned me false as result.
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Associativity of “in” in Python?
I'm making a Python parser, and this is really confusing me:
4 Answers
4
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How can I get the DateTime for the start of the week?
...Week);
If you would like any other day of the week to be your start date all you need to do is add the DayOfWeek value to the end
var monday = DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek + (int)DayOfWeek.Monday);
var tuesday = DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek + (in...
How to test a merge without actually merging first
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@samirahmed: @Amber answered the question more literally, sure, although with --no-commit you're still changing the index and the working tree, which isn't exactly "without making any changes" :) My point is that when people ask this kind of question, it's generally because th...
SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
...chain Groups+Turn On
An answer here, from Apple:
UPDATE: We have finally been able to reproduce the -34018 error on iOS
8.3. This is the first step in identifying the root cause and then coming up with a fix.
As usual, we can't commit to a release timeframe, but this has
affected man...
How do I ZIP a file in C#, using no 3rd-party APIs?
...file extension to associate the download file with our desktop app. One small problem we ran into was that its not possible to just use a third-party tool like 7-zip to create the zip files because the client side code can't open it -- ZipPackage adds a hidden file describing the content type of ea...
How to create a static library with g++?
...his is highly misleading. And why should you "never" create an executable called test?
– Lightness Races in Orbit
May 10 '11 at 8:28
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Difference between string and char[] types in C++
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A char array is just that - an array of characters:
If allocated on the stack (like in your example), it will always occupy eg. 256 bytes no matter how long the text it contains is
If allocated on the heap (using malloc() or new char[]) you're responsible for releasing the memory...
HSL to RGB color conversion
... The wikipedia article seems to suggest that only a single value is set to all 3 channels.
– Bill
Jan 14 '14 at 17:58
10
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I need to store postal codes in a database. How big should the column be?
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Good link. Even allowing for the punctuation in US ZIP+4, 10 characters would be enough for any country as far as I could tell.
– Jonathan Leffler
Nov 28 '08 at 5:36
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