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Is Java Regex Thread Safe?
...pers
*/
public final class Validators {
private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*(\\.[A-Za-z]{2,})$";
private static Pattern email_pattern;
static {
email_pattern = Pattern.compile(EMAIL_PATTERN);
}
/**
* Check...
Is it possible to use JavaScript to change the meta-tags of the page?
...ues.
Examples
Skype: Switch off phone number parser
<meta name="SKYPE_TOOLBAR" content="SKYPE_TOOLBAR_PARSER_COMPATIBLE">
iPhone: Switch off phone number parser
<meta name="format-detection" content="telephone=no">
Google Chrome Frame
<meta http-equiv="X-UA-Compatible" conten...
Basic HTTP authentication with Node and Express 4
...substring(splitIndex + 1)
// using shorter regex by @adabru
// const [_, login, password] = strauth.match(/(.*?):(.*)/) || []
Basic auth in one statement
...on the other hand, if you only ever use one or very few logins, this is the bare minimum you need: (you don't even need to parse the cr...
What is the point of function pointers?
...ss functor {
public:
functor(const std::string& prompt) : prompt_(prompt) {}
void operator()(int i) {std::cout << prompt_ << i << '\n';}
private:
std::string prompt_;
};
functor f("the answer is: ");
f(42);
Another advantage is that it is sometimes easier ...
Given two directory trees, how can I find out which files differ by content?
...-dereference --new-file --no-ignore-file-name-case /dir1 /dir2 > dirdiff_1.txt
rsync --recursive --delete --links --checksum --verbose --dry-run /dir1/ /dir2/ > dirdiff_2.txt
The choice between them depends on the location of dir1 and dir2:
When the directories reside on two seperate drive...
How to get all properties values of a JavaScript Object (without knowing the keys)?
...nd val
}
Object.values shim
Finally, as noted in the comments and by teh_senaus in another answer, it may be worth using one of these as a shim. Don't worry, the following does not change the prototype, it just adds a method to Object (which is much less dangerous). Using fat-arrow functions, thi...
Escape a string for a sed replace pattern
...es, forward slash for end of statement and & for replace all):
ESCAPED_REPLACE=$(printf '%s\n' "$REPLACE" | sed -e 's/[\/&]/\\&/g')
# Now you can use ESCAPED_REPLACE in the original sed statement
sed "s/KEYWORD/$ESCAPED_REPLACE/g"
If you ever need to escape the KEYWORD string, the fol...
C++ templates that accept only certain types
...
I suggest using Boost's static assert feature in concert with is_base_of from the Boost Type Traits library:
template<typename T>
class ObservableList {
BOOST_STATIC_ASSERT((is_base_of<List, T>::value)); //Yes, the double parentheses are needed, otherwise the comma will b...
Does Java 8 provide a good way to repeat a value or function?
...be inlined well.
Here's the code:
public static final int LIMIT = 500_000_000;
public static final long VALUE = 3L;
public long range() {
return
LongStream.range(0, LIMIT)
.parallel()
.map(i -> VALUE)
.map(i -> ...
What happens if you static_cast invalid value to enum class?
... to the enumeration type, no value in data[0] can lead to UB for the static_cast.
After CWG 1766 (C++17)
See CWG defect 1766.
The [expr.static.cast]p10 paragraph has been strengthened, so you now can invoke UB if you cast a value that is outside the representable range of an enum to the enum type. ...