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How to validate phone numbers using regex
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42 Answers
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NSUserDefaults not cleared after app uninstall on simulator
... now is to click, iOS Simulator -> Reset Content and Settings.
Xcode 9.2 with Simulator 10 still presents this issue. Menu option is now Hardware .. Erase All Content and Settings
I submitted a bug report btw
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PHP substring extraction. Get the string before the first '/' or the whole string
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262
Use explode()
$arr = explode("/", $string, 2);
$first = $arr[0];
In this case, I'm using th...
(13: Permission denied) while connecting to upstream:[nginx]
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I had a similar issue getting Fedora 20, Nginx, Node.js, and Ghost (blog) to work. It turns out my issue was due to SELinux.
This should solve the problem:
setsebool -P httpd_can_network_connect 1
Details
I checked for errors in the SELinux logs:
sudo cat ...
Accessing members of items in a JSONArray with Java
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218
Have you tried using JSONArray.getJSONObject(int), and JSONArray.length() to create your for-l...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
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842
Use collections.Counter:
>>> from collections import Counter
>>> A = Counter(...
Python UTC datetime object's ISO format doesn't include Z (Zulu or Zero offset)
Why python 2.7 doesn't include Z character (Zulu or zero offset) at the end of UTC datetime object's isoformat string unlike JavaScript?
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How can I get Eclipse to show .* files?
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12 Answers
12
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Reorder levels of a factor without changing order of values
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121
Use the levels argument of factor:
df <- data.frame(f = 1:4, g = letters[1:4])
df
# f g
#...
Installing older version of R package
I am trying to use Rpy2 and ggplot2 but I get an error. After some searching for the error online, I found that the error occurs because there are changes in the ggplot2 package that are not yet reflected in Rpy2 (for example, see this post (Edit: Link is now dead)).
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