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Check if a JavaScript string is a URL
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A related question with an answer:
Javascript regex URL matching
Or this Regexp from Devshed:
function validURL(str) {
var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|...
How to normalize a path in PowerShell?
...ination of pwd, Join-Path and [System.IO.Path]::GetFullPath to get a fully qualified expanded path.
Since cd (Set-Location) doesn't change the process current working directory, simply passing a relative file name to a .NET API that doesn't understand PowerShell context, can have unintended side-ef...
Elegant way to invert a map in Scala
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Assuming values are unique, this works:
(Map() ++ origMap.map(_.swap))
On Scala 2.8, however, it's easier:
origMap.map(_.swap)
Being able to do that is part of the reason why Scala 2.8 has a new collection library.
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How does this print “hello world”?
... | 01111
p | 112 | 1110000 | 10000
q | 113 | 1110001 | 10001
r | 114 | 1110010 | 10010
s | 115 | 1110011 | 10011
t | 116 | 1110100 | 10100
u | ...
Is there a literal notation for an array of symbols?
...nately the list of available %-delimiters is limited
Modifier Meaning
%q[ ] Non-interpolated String (except for \\ \[ and \])
%Q[ ] Interpolated String (default)
%r[ ] Interpolated Regexp (flags can appear after the closing delimiter)
%s[ ] Non-interpolated Symbol
%w[ ] ...
How to replace a character by a newline in Vim
...echo 'Before:'; xxd test) > output.txt
vim test '+s/b/\n/' '+s/a/\r/' +wq
(echo 'After:'; xxd test) >> output.txt
more output.txt
Before:
0000000: 6261 720a bar.
After:
0000000: 000a 720a ..r.
In other words, \n has inserted t...
Get user info via Google API
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You can just query this url, using the access token you get after user has authorized you to access this scope. Example: curl -X GET "https://www.googleapis.com/oauth2/v1/userinfo?alt=json" -H"Authorization: Bearer accessTokenHere"
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How to print the values of slices
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I prefer fmt.Printf("%+q", arr) which will print
["some" "values" "list"]
https://play.golang.org/p/XHfkENNQAKb
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pandas resample documentation
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B business day frequency
C custom business day frequency (experimental)
D calendar day frequency
W weekly frequency
M month end frequency
SM semi-month end frequency (15th and end of month)
BM busi...
Applying a function to every row of a table using dplyr?
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Can you refer to Sepal.Length and Petal.Length by their index number in some way? If you have lots of variables did would be handy. Like ... Max.len = max( [c(1,3)] ) ?
– Rasmus Larsen
Jun 19 '14 at 7:43
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