大约有 47,000 项符合查询结果（耗时：0.0466秒） [XML]
What does the [Flags] Enum Attribute mean in C#?
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2187
The [Flags] attribute should be used whenever the enumerable represents a collection of possibl...
How can I count the number of matches for a regex?
...for Java 9+
long matches = matcher.results().count();
Solution for Java 8 and older
You'll have to do the following. (Starting from Java 9, there is a nicer solution)
int count = 0;
while (matcher.find())
count++;
Btw, matcher.groupCount() is something completely different.
Complete exam...
Getting image dimensions without reading the entire file
...x42, 0x4D }, DecodeBitmap},
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x37, 0x61 }, DecodeGif },
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x39, 0x61 }, DecodeGif },
{ new byte[]{ 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, DecodePng },
{ new byte[]{ 0xf...
while (1) Vs. for (;;) Is there a speed difference?
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218
In perl, they result in the same opcodes:
$ perl -MO=Concise -e 'for(;;) { print "foo\n" }'
a ...
How can I get a Bootstrap column to span multiple rows?
...br/>
</div>
</div>
<div class="col-md-8">
<div class="row">
<div class="col-md-6">
<div class="well">2</div>
</div>
<div class="col-md-6">
<...
Efficient way to rotate a list in python
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287
A collections.deque is optimized for pulling and pushing on both ends. They even have a dedicat...
Combine two data frames by rows (rbind) when they have different sets of columns
... Jyotirmoy BhattacharyaJyotirmoy Bhattacharya
8,19733 gold badges2626 silver badges3636 bronze badges
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How to check status of PostgreSQL server Mac OS X
...look for a command that looks something like this (your version may not be 8.3):
/Library/PostgreSQL/8.3/bin/postgres -D /Library/PostgreSQL/8.3/data
To start the server, execute something like this:
/Library/PostgreSQL/8.3/bin/pg_ctl start -D /Library/PostgreSQL/8.3/data -l postgres.log
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Loading custom configuration files
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OliverOliver
37.1k77 gold badges8080 silver badges132132 bronze badges
1
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Is there a ceiling equivalent of // operator in Python?
...Machavity♦
27.5k1616 gold badges7171 silver badges8787 bronze badges
answered Feb 11 '13 at 22:35
Charles SalviaCharles Salvia
4...