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Rails: What's a good way to validate links (URLs)?
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this only checks if the url start with http:// or https:// , it's not a proper URL validation
– maggix
Jul 10 '13 at 9:52
1
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What is the difference between Nexus and Maven?
...nt this things. Nexus Repository Manager and Nexus Repository Manager OSS started as a repository manager
supporting the Maven repository format. While it supports many other repository formats now, the
Maven repository format is still the most common and well supported format for build and provisi...
How to read/write from/to file using Go?
...les I copy a file by reading from it and writing to the destination file.
Start with the basics
package main
import (
"io"
"os"
)
func main() {
// open input file
fi, err := os.Open("input.txt")
if err != nil {
panic(err)
}
// close fi on exit and check for it...
Implements vs extends: When to use? What's the difference?
...nts is for when you're implementing an interface.
Here is a good place to start: Interfaces and Inheritance.
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Versioning SQL Server database
...on control. Does anyone have any advice or recommended articles to get me started?
29 Answers
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What is a good Hash Function?
...hms vetted by public scrutiny. The Hash Function Lounge is a good place to start.
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Using sed and grep/egrep to search and replace
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"\.jpg|\.png|\.gif": match one of the strings ".jpg", ".gif" or ".png"
.: start the search in the current directory
xargs: execute a command with the stdin as argument
-0: use \0 as record separator. This is important to match the -Z of egrep and to avoid being fooled by spaces and newlines in i...
SQL update fields of one table from fields of another one
...unwanted parenthesis around string in plpgsql
Update multiple columns that start with a specific string
Partial solutions with plain SQL
With list of shared columns
You still need to know the list of column names that both tables share. With a syntax shortcut for updating multiple columns - shorter...
The role of #ifdef and #ifndef
...be two closing endif lines at some point and the first will cause lines to start being included again, as follows:
#define one 0
+--- #ifdef one
| printf("one is defined "); // Everything in here is included.
| +- #ifndef one
| | printf("one is not defined "); // Everything in here is ...
Why use String.Format? [duplicate]
...ce Concat can create an internal buffer of exactly the right size from the start. A SB is used when you have some sort of loop or other control block such that the number of strings being concatted isn't known by the compiler at compile time.
– Servy
Mar 19 '1...