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Regular Expression for alphanumeric and underscores
I would like to have a regular expression that checks if a string contains only upper and lowercase letters, numbers, and underscores.
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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
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Whatever you do, I highly advise against the third option: Returning a string that says "WTF".
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Convert base-2 binary number string to int
I'd simply like to convert a base-2 binary number string into an int, something like this:
8 Answers
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Capturing Groups From a Grep RegEx
... name="${BASH_REMATCH[1]}"
echo "${name}.jpg" # concatenate strings
name="${name}.jpg" # same thing stored in a variable
else
echo "$f doesn't match" >&2 # this could get noisy if there are a lot of non-matching files
fi
done
It's better to put the ...
How to “pretty” format JSON output in Ruby on Rails
...nController::Renderers.add :json do |json, options|
unless json.kind_of?(String)
json = json.as_json(options) if json.respond_to?(:as_json)
json = JSON.pretty_generate(json, options)
end
if options[:callback].present?
self.content_type ||= Mime::JS
"#{options[:callback]}(#{jso...
Emulate a do-while loop in Python?
...lso, is this real code where you are processing comments? What if you have strings with slashes? ie: print "blah // <-- does that mess you up?"
– Tom
Apr 13 '09 at 7:44
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Number of days between two dates in Joda-Time
...o achieve the behavior of android.text.format.DateUtils.getRelativeTimeSpanString() with joda and this was really useful.
– gosho_ot_pochivka
Jun 27 '13 at 10:28
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Why is this program erroneously rejected by three C++ compilers?
...Image.open('helloworld.png') # Open image object using PIL
print image_to_string(image) # Run tesseract.exe on image
To use it, do:
python script.py > helloworld.cpp; g++ helloworld.cpp
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lenses, fclabels, data-accessor - which library for structure access and mutation is better
...s implementation you use.
Many of these libraries also provide a bunch of extra combinators on top, and usually some form of template haskell machinery to automatically generate lenses for the fields of simple record types.
With that in mind, we can turn to the different implementations:
Implemen...
Convert a Map to a POJO
...o = mapper.convertValue(map, MyPojo.class);
No need to convert into JSON string or something else; direct conversion does much faster.
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