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Grep regex NOT containing string
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351
grep matches, grep -v does the inverse. If you need to "match A but not B" you usually use pipe...
What is a 'semantic predicate' in ANTLR?
...ws Exception {
ANTLRStringStream in = new ANTLRStringStream("123, 456, 7 , 89");
NumbersLexer lexer = new NumbersLexer(in);
CommonTokenStream tokens = new CommonTokenStream(lexer);
NumbersParser parser = new NumbersParser(tokens);
parser.parse();
}
}
T...
How do I download a tarball from GitHub using cURL?
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5 Answers
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Math.random() versus Random.nextInt(int)
...ts in its mantissa, so it is uniformly distributed in the range 0 to 1-(2^-53).
Random.nextInt(n) uses Random.next() less than twice on average- it uses it once, and if the value obtained is above the highest multiple of n below MAX_INT it tries again, otherwise is returns the value modulo n (t...
How do I do base64 encoding on iOS?
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115
This is a good use case for Objective C categories.
For Base64 encoding:
#import <Foundatio...
Pandas groupby: How to get a union of strings
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In [4]: df = read_csv(StringIO(data),sep='\s+')
In [5]: df
Out[5]:
A B C
0 1 0.749065 This
1 2 0.301084 is
2 3 0.463468 a
3 4 0.643961 random
4 1 0.866521 string
5 2 0.120737 !
In [6]: df.dtypes
Out[6]:
A int64
B fl...
Drawable image on a canvas
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edited Dec 15 '18 at 12:07
answered Apr 8 '14 at 8:36
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