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Replacing all non-alphanumeric characters with empty strings
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Use [^A-Za-z0-9].
Note: removed the space since that is not typically considered alphanumeric.
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What do hjust and vjust do when making a plot using ggplot?
Every time I make a plot using ggplot, I spend a little while trying different values for hjust and vjust in a line like
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Multiprocessing - Pipe vs Queue
What are the fundamental differences between queues and pipes in Python's multiprocessing package ?
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Create a pointer to two-dimensional array
I need a pointer to a static 2-dimensional array. How is this done?
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Extract a part of the filepath (a directory) in Python
I need to extract the name of the parent directory of a certain path. This is what it looks like:
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ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'
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No, you should run mysql -u root -p in bash, not at the MySQL command-line.
If you are in mysql, you can exit by typing exit.
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Getting all types that implement an interface
Using reflection, how can I get all types that implement an interface with C# 3.0/.NET 3.5 with the least code, and minimizing iterations?
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How do I use Wget to download all images into a single folder, from a URL?
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Try this:
wget -nd -r -P /save/location -A jpeg,jpg,bmp,gif,png http://www.somedomain.com
Here is some more information:
-nd prevents the creation of a directory hierarchy (i.e. no directories).
-r enables recursive retrieval. See Recursive Dow...
How do I create a parameterized SQL query? Why Should I?
I've heard that "everyone" is using parameterized SQL queries to protect against SQL injection attacks without having to vailidate every piece of user input.
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How to turn on front flash light programmatically in Android?
I want to turn on front flash light (not with camera preview) programmatically in Android. I googled for it but the help i found referred me to this page
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