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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...
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 ...
C++ Convert string (or char*) to wstring (or wchar_t*)
...
Assuming that the input string in your example (おはよう) is a UTF-8 encoded (which it isn't, by the looks of it, but let's assume it is for the sake of this explanation :-)) representation of a Unicode string of your interest, then your problem can be fully solved with the standard library ...
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...
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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MySQL: What's the difference between float and double?
...get rounded and decimals do not. Decimal(9,3) could be for example 123456.789 whereas if you tried to store 123456.789 it would get inserted as 123456.0 as a float.
– Blake
Mar 6 '18 at 20:18
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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...
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">
<...