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Has reCaptcha been cracked / hacked / OCR'd / defeated / broken? [closed]
...y tried numerous reCAPTCHA images, and it was actually some of the easiest ones (or at least quickest) broken.
UPDATE: CAPTCHA Killer's website is now taken down, apparently under legal pressure. See http://captcha.org/ for a complete overview of the topic.
And yeah, OCR is not the best way to b...
Fast way of finding lines in one file that are not in another?
...ormat new (added), old (removed) and unchanged lines respectively. Setting one to empty "" prevents output of that kind of line.
If you are familiar with unified diff format, you can partly recreate it with:
diff --old-line-format="-%L" --unchanged-line-format=" %L" \
--new-line-format="+%L" ...
Regular expression for floating point numbers
...oid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See a working example
If you also want to match 12...
Visual Studio Project vs. Solution
...eptual feature of a VS project (what determines its 'granularity') is that one project produces one output: typically an executable or a library (dll). So, if you are going to code three executables that uses related code, you'll create one solution and at least three projects - probably more.
...
HTML5 best practices; section/header/aside/article elements
... the "best practices". Tags like section/headers/article are new, and everyone has different opinions about when/where you should use these tags. So what do you guys think of the following layout and code?
...
Nullable Foreign Key bad practice?
...y key in that link table the relationship is still 1..n. There can only be one entry in that link table per order.
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scheduleAtFixedRate vs scheduleWithFixedDelay
...g coffee
02:10: Finish making coffee
If I schedule with a fixed delay of one hour, I'd have:
00:00: Start making coffee
00:10: Finish making coffee
01:10: Start making coffee
01:20: Finish making coffee
02:20: Start making coffee
02:30: Finish making coffee
Which one you want depends on your ta...
What's the best practice for primary keys in tables?
When designing tables, I've developed a habit of having one column that is unique and that I make the primary key. This is achieved in three ways depending on requirements:
...
Should each and every table have a primary key?
...e link. Thus you ensure that you don't have two or more records describing one link.
Besides the logical consistency issues, most RDBMS engines will benefit from including these fields in a unique index.
And since any primary key involves creating a unique index, you should declare it and get both...
JPA EntityManager: Why use persist() over merge()?
EntityManager.merge() can insert new objects and update existing ones.
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