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Regex empty string or email
...hing an email address (that is, if you want wrong code that happens to (usually) work), use the regular-expressions.info link someone else submitted.
As for the empty string, ^$ is mentioned by multiple people and will work fine.
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How can I read a large text file line by line using Java?
...ce the Stream in a try-with-resource block to ensure the #close method is called on it, otherwise the underlying file handle is never closed until GC does it much later.
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is it possible to update UIButton title/text programmatically?
...to update the title/text of the UIButton to reflect the new state. I'm calling:
12 Answers
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What is the argument for printf that formats a long?
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Actually, you should change it to be %ld, to be more harmonic with OP question.
– DrBeco
Jun 21 '15 at 5:28
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How to close tag properly?
...es the tag properly. Best to add the alt attribute for people that are visually impaired.
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Rake just one migration
...n a single migration that changed and needed to be re-run independently of all other migrations. Fire up the console and do this:
>> require 'db/migrate/your_migrations.rb'
=> ["YourMigrations"]
>> YourMigrations.up
=> etc... as the migration runs
>> YourMigration.down
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Ruby convert Object to Hash
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instance_values can be used for all ruby objects for the similar output.
– bishal
Jan 22 '19 at 11:37
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Recent file history in Vim?
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:e #<1 opens last file, see :h c_#<.
– Hotschke
Dec 15 '15 at 16:42
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How can I reset a react component including all transitively reachable state?
I occasionally have react components that are conceptually stateful which I want to reset. The ideal behavior would be equivalent to removing the old component and readding a new, pristine component.
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Difference between filter and filter_by in SQLAlchemy
... filter on users.id. Instead, it will evaluate id == id as True and return all users. You need to use .filter(users.id == id) (as demoed above). I made this mistake earlier today.
– Nico Cernek
Feb 22 '19 at 23:00
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