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How to check if a string contains only digits in Java [duplicate]
...\\d+";
As per Java regular expressions, the + means "one or more times" and \d means "a digit".
Note: the "double backslash" is an escape sequence to get a single backslash - therefore, \\d in a java String gives you the actual result: \d
References:
Java Regular Expressions
Java Character Es...
CSS performance relative to translateZ(0)
...n element is 3D by using transform: translateZ(0) to speed up animations and transitions. I was wondering if there are implications to using this transform in the following manner:
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...
The explanation comes from Agner Fog in Optimizing software in C++ and it reduces to how data is accessed and stored in the cache.
For terms and detailed info, see the wiki entry on caching, I'm gonna narrow it down here.
A cache is organized in sets and lines. At a time, only one set is u...
Understanding dict.copy() - shallow or deep?
... 3, 4, 5]}, {1: [1, 2, 3, 4]})
So:
b = a: Reference assignment, Make a and b points to the same object.
b = a.copy(): Shallow copying, a and b will become two isolated objects, but their contents still share the same reference
b = copy.deepcopy(a): Deep copying, a and b's structure and conte...
Remote connect to clearDB heroku database
...eroku using for example MySQL Query Browser. Where to get url, port, login and password?
12 Answers
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Find string between two substrings [duplicate]
... edited Apr 26 '19 at 15:51
andilabs
16.9k1111 gold badges9393 silver badges123123 bronze badges
answered Jul 30 '10 at 5:59
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Getting only response header from HTTP POST using curl
...rite the protocol headers to the specified file.
This option is handy to use when you want to store the headers
that a HTTP site sends to you. Cookies from the headers could
then be read in a second curl invocation by using the -b,
--cookie option! The -c, --...
Iterate through a C++ Vector using a 'for' loop
I am new to the C++ language. I have been starting to use vectors, and have noticed that in all of the code I see to iterate though a vector via indices, the first parameter of the for loop is always something based on the vector. In Java I might do something like this with an ArrayList:
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Adjusting the Xcode iPhone simulator scale and size [duplicate]
...5 in Xcode, be the actual size of the iPhone 5. I'm getting a huge display and things seemed to be scaled.
8 Answers
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Generic method multiple (OR) type constraint
...t types. That means you could just as well leave out the generic parameter and provide overloads.
– Botz3000
May 31 '12 at 13:00
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