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How to match any non white space character except a particular one?
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156
You can use a character class:
/[^\s\\]/
matches anything that is not a whitespace characte...
How to check if a table exists in a given schema
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answered Jun 6 '14 at 19:58
Erwin BrandstetterErwin Brandstetter
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Regular expression to match balanced parentheses
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21 Answers
21
Active
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how to get the current working directory's absolute path from irb
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521
Dir.pwd seems to do the trick.
http://ruby-doc.org/core/Dir.html#method-c-pwd
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How can I detect if a file is binary (non-text) in python?
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edited Nov 4 '17 at 14:18
A. Hennink
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answered May 22 '...
Finding quaternion representing the rotation from one vector to another
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117
Quaternion q;
vector a = crossproduct(v1, v2);
q.xyz = a;
q.w = sqrt((v1.Length ^ 2) * (v2.Len...
Regular expressions in C: examples?
...s):
#include <regex.h>
regex_t regex;
int reti;
char msgbuf[100];
/* Compile regular expression */
reti = regcomp(&regex, "^a[[:alnum:]]", 0);
if (reti) {
fprintf(stderr, "Could not compile regex\n");
exit(1);
}
/* Execute regular expression */
reti = regexec(&regex,...
Why does this iterative list-growing code give IndexError: list assignment index out of range?
...ample below), and later, overwrite the values in specific positions:
i = [1, 2, 3, 5, 8, 13]
j = [None] * len(i)
#j == [None, None, None, None, None, None]
k = 0
for l in i:
j[k] = l
k += 1
The thing to realise is that a list object will not allow you to assign a value to an index that doe...